Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fbd09257324ac8c…

MALICIOUS

PDF

40.4 KB Created: 2020-08-04 18:58:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9eb0b9c78a4630ce26fc1f56feb9cf42 SHA-1: c155a76fac99b43cdc950713adb540b6cb87d558 SHA-256: 0fbd09257324ac8c69e8866f118e7cfd612b2d2bbdb25916efd3c01bcb9676b2
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm for SEO manipulation. One of the primary links redirects to a malicious URL, indicating a phishing or malware distribution attempt. 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.cc/pify?keyword=grade+4+math+practice+worksheets+pdf
    • http://files.sgpropertycity.com/uploads/1/3/1/6/131606953/rivumotumo.pdf
    • http://files.cichlidsanctuarynewworldhybrids.com/uploads/1/3/1/8/131856068/zetujidiwabe.pdf
    • http://files.tecsmithinc.com/uploads/1/3/2/8/132814030/1768547.pdf
    • http://files.exceedthestandard.com/uploads/1/3/1/4/131406606/kuvamalu_fajutilelokoki.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/3667/2162/files/nojunez.pdf
    • https://cdn.shopify.com/s/files/1/0432/0336/2973/files/82021753895.pdf
    • https://cdn.shopify.com/s/files/1/0431/1348/0343/files/mebonoke.pdf
    • https://cdn.shopify.com/s/files/1/0434/0557/4309/files/67901178897.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/dokole.pdf
    • https://cdn.shopify.com/s/files/1/0429/5314/6517/files/gulisetunut.pdf
    • https://cdn.shopify.com/s/files/1/0428/3367/4396/files/kojurif.pdf
    • https://cdn.shopify.com/s/files/1/0432/1463/5165/files/94120888429.pdf
    • https://cdn.shopify.com/s/files/1/0430/7098/0245/files/bumemutoxomusi.pdf
    • https://cdn.shopify.com/s/files/1/0429/4737/9356/files/pipilelamuranuvubaja.pdf
    • https://cdn.shopify.com/s/files/1/0433/3420/5590/files/20084139189.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_off00005ec1.bin
465c938ed6c36a6f30c486fdcdc72b1a0852444ca496acf16cc2e007e8cc5bcd
pdf-font-stream PDF embedded font (sfnt) at offset 0x5EC1 5640 bytes
font_01_sfnt_off000071df.bin
f176eb601ae24f2db58926f7fccee3fb8f4df7feda991b34555597fd9d8dec12
pdf-font-stream PDF embedded font (sfnt) at offset 0x71DF 10164 bytes