Malicious PDF — malware analysis report

Static analysis result for SHA-256 141bd0071a114b87…

MALICIOUS

PDF

40.2 KB Created: 2020-08-26 02:19:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3a852a26668b96d65dd60d5dba2561ef SHA-1: 9895d01fadf43db4c5d998d0587858aef7f2587a SHA-256: 141bd0071a114b8708bd1f9115360ad9b6bdf27cc779436e6c0b34ca1524b55a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many of which point to external PDF files hosted on various domains, suggesting a link farm or SEO manipulation tactic. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.ru/pify?keyword=necrologie+republicain+lorrain+meurthe+et+moselle'. The document body, though partially obfuscated, contains this same URL, indicating an attempt to direct users to malicious content. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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.ru/pify?keyword=necrologie+republicain+lorrain+meurthe+et+moselle
    • http://files.susannahnix.com/uploads/1/3/1/4/131452872/5951469.pdf
    • http://jifom.sertlehimleme.com/uploads/1/3/1/3/131383775/sigurubimosi_dazulirafije_miwade.pdf
    • http://files.grizzinator.com/uploads/1/3/1/8/131856771/87f964.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/0814/8127/files/88245300740.pdf
    • https://cdn.shopify.com/s/files/1/0431/2478/5313/files/27829703754.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/liwisubusamepumiv.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/41448402009.pdf
    • https://cdn.shopify.com/s/files/1/0431/6617/1285/files/sarkari_result_vdo_admit_card_2018.pdf
    • https://cdn.shopify.com/s/files/1/0466/7064/3365/files/15343801281.pdf
    • https://cdn.shopify.com/s/files/1/0431/2619/4342/files/retapid.pdf
    • https://cdn.shopify.com/s/files/1/0431/4031/7350/files/27163956074.pdf
    • https://cdn.shopify.com/s/files/1/0433/1002/2814/files/budinakejidorowusu.pdf
    • https://cdn.shopify.com/s/files/1/0430/7661/6341/files/fozonuzavurasonuwiloru.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005d44.bin
c6285ae0264436af872e18251c407f37f23fe875b2422ff60ed0dee58c5428aa
pdf-font-stream PDF embedded font (sfnt) at offset 0x5D44 5456 bytes
font_01_sfnt_off00006fa4.bin
a9d0511c4d4cf5c3cb2ff8d185dc11df4c319b095a2acca21089b015dee4ff6d
pdf-font-stream PDF embedded font (sfnt) at offset 0x6FA4 11468 bytes