Malicious PDF — malware analysis report

Static analysis result for SHA-256 352839cb6f1913a3…

MALICIOUS

PDF

42.1 KB Created: 2020-07-08 11:46:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-04
MD5: ca6659e6b952088d31dbbed0977d3603 SHA-1: cabae3a20f9a5ecf8c17180bbc5db0456d0d7105 SHA-256: 352839cb6f1913a31949d7ced1541520edeadce45cf6551f5195bedfa598efbc
192 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, including one to a known malicious redirector, and a large number of links to external PDFs hosted on various domains. The document body text, though partially corrupted, suggests a lure for a 'facility management handbook pdf free download'. This indicates a phishing or social engineering attack aimed at tricking users into downloading potentially malicious content. No scripts were extracted, and the primary malicious activity appears to be the distribution of links.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.cc/wb?keyword=facility%20management%20handbook%20pdf%20free%20download In PDF document text
    • http://files.lifechurchsouthmansfield.co.uk/uploads/1/3/1/4/131454634/vumoxe.pdfIn PDF document text
    • http://files.theosophy-dunedin.org/uploads/1/3/1/4/131483019/xarika_fukuguluxugu_gemex.pdfIn PDF document text
    • http://files.gamesfortime.com/uploads/1/3/1/4/131453725/9963223.pdfIn PDF document text
    • http://files.girlytingz2.com/uploads/1/3/1/4/131437538/bidomosarodan_pivojom_vesekerixiwilo_bakek.pdfIn PDF document text
    • http://files.veraxcomic.net/uploads/1/3/0/9/130968956/fadawoku-duzosoketeduv-nimeninusas.pdfIn PDF document text
    • http://files.petpassions.net/uploads/1/3/1/4/131453007/4417121.pdfIn PDF document text
    • http://files.actingcoachlasvegas.com/uploads/1/3/2/6/132681566/lejele.pdfIn PDF document text
    • http://files.kathrynconeway.com/uploads/1/3/0/7/130739769/f1df05.pdfIn PDF document text
    • http://files.mrsararadian.com/uploads/1/3/1/4/131453676/725d0ad5d8b20d.pdfIn PDF document text
    • http://files.bradfordvdub.org/uploads/1/3/1/6/131606550/7388838.pdfIn PDF document text
    • http://files.rayoflightministries.com/uploads/1/3/1/3/131380953/8118526.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://makilope.files.wordpress.com/2020/06/50091380100.pdfIn PDF document text
    • https://kejivugufe.files.wordpress.com/2020/06/23767010058.pdfIn PDF document text
    • https://metefodowu.files.wordpress.com/2020/06/puwutaxirewapikiweged.pdfIn PDF document text
    • https://rexakufemuv.files.wordpress.com/2020/06/lolega.pdfIn PDF document text
    • https://najileriwis.files.wordpress.com/2020/06/kafisaxokanejaw.pdfIn PDF document text
    • https://xusurubisi.files.wordpress.com/2020/06/dimuze.pdfIn PDF document text
    • https://mixisimukagi.files.wordpress.com/2020/06/paniwutere.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000667d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x667D 5532 bytes
SHA-256: b54069e52ff8bb525fcadf4bc65141b9726715134630be13ce27a78e14606cdd
font_01_sfnt_off00007927.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7927 9920 bytes
SHA-256: ac29d311b7b3c22a458f1d82cf996f8f3d383694bac6206e76959895d5600d1e