Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2d1ebc9e6460b8f…

MALICIOUS

PDF

33.9 KB Created: 2020-08-10 17:53:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e4dad0b926f7f22a40b6d54717452ea1 SHA-1: 1ba7e21036b18bc411a8d88e639e14ca0a4d2804 SHA-256: b2d1ebc9e6460b8f066f0b2bd8d69165ad64e887e7df24a27d934fb7b484eaa3
154 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with one critical link pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://ttraff.cc/pify?keyword=uganda+catholic+songs+pdf', which is a strong indicator of malicious intent. The ML classifier also strongly flagged this PDF as malicious. The primary attack pattern involves luring the user to click on the malicious redirector.

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=uganda+catholic+songs+pdf
    • http://files.lamodemagazine.net/uploads/1/3/1/3/131383453/bdc3218611b0ec.pdf
    • http://files.jenniferlovegironda.com/uploads/1/3/0/8/130874615/muwuwesera_liruparag.pdf
    • http://files.epnonprofit.org/uploads/1/3/1/4/131483108/rukowixoxamunixejaxo.pdf
    • http://files.clairelyseenphoto.com/uploads/1/3/1/3/131380842/lasulovirodum-disujipego-dowosak.pdf
    • https://cdn.shopify.com/s/files/1/0431/6259/9584/files/jodix.pdf
    • https://cdn.shopify.com/s/files/1/0434/6737/4758/files/zubanazirojiximilave.pdf
    • https://cdn.shopify.com/s/files/1/0434/1517/5335/files/80766184360.pdf
    • https://cdn.shopify.com/s/files/1/0429/6930/1151/files/fidamunudukefofovixaj.pdf
    • https://cdn.shopify.com/s/files/1/0432/0008/6180/files/45051138135.pdf
    • https://cdn.shopify.com/s/files/1/0428/4838/7239/files/kuxabirefodop.pdf
    • https://cdn.shopify.com/s/files/1/0434/5551/2738/files/jimekujawum.pdf
    • https://cdn.shopify.com/s/files/1/0438/9509/5451/files/vedowif.pdf
    • https://cdn.shopify.com/s/files/1/0432/6909/5590/files/bisamevewaw.pdf
    • https://cdn.shopify.com/s/files/1/0440/3567/0166/files/jokuwajarofavekajojigova.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tadigepulimo.pdf
    • https://cdn.shopify.com/s/files/1/0431/3789/2509/files/82461457846.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000045b6.bin
afeeb208803359132779fda2f2fa605e6444e032a7f7d5d4e57770ff61203e84
pdf-font-stream PDF embedded font (sfnt) at offset 0x45B6 5312 bytes
font_01_sfnt_off000057c9.bin
5af2f12c57deac8f727e5d3f463af523d295a2bf78d91313ff3e353e88199ed6
pdf-font-stream PDF embedded font (sfnt) at offset 0x57C9 10228 bytes