Malicious PDF — malware analysis report

Static analysis result for SHA-256 979dc9b9945f0fab…

MALICIOUS

PDF

44.4 KB Created: 2020-08-18 15:06:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c8ffb2535ed97fbb7ad577c2aa994dae SHA-1: dd8d9f19fe4d1461e55a355dc79a1c88208d9b5a SHA-256: 979dc9b9945f0fab30ff9495887eea16cb1bddcebc1ab89a9b6a414cb2fe99e7
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains embedded links, with one pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text suggesting it's a 'dcfs report form california' and includes the malicious URL. The presence of numerous external PDF links further indicates a link farm strategy, likely intended to redirect users to malicious content.

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.com/pify?keyword=dcfs+report+form+california
    • http://files.createeducate.com/uploads/1/3/1/4/131453276/noluz.pdf
    • http://files.dewarsinnontheriver.com/uploads/1/3/1/8/131856353/4616987.pdf
    • http://files.norcalpomeranians.com/uploads/1/3/1/4/131437702/f8e984a7d.pdf
    • http://files.happybuddhadogtraining.com/uploads/1/3/0/9/130969231/6987845.pdf
    • https://cdn.shopify.com/s/files/1/0430/7936/8858/files/beautiful_wallpaper_4k_apk.pdf
    • https://cdn.shopify.com/s/files/1/0436/3390/1726/files/83163402104.pdf
    • https://cdn.shopify.com/s/files/1/0436/8426/6137/files/16149017016.pdf
    • https://cdn.shopify.com/s/files/1/0434/4371/6262/files/tibivefob.pdf
    • https://cdn.shopify.com/s/files/1/0429/6110/9155/files/dagukuvisizibisekaval.pdf
    • https://cdn.shopify.com/s/files/1/0428/9573/6988/files/gabejirijuwakidadukuzidux.pdf
    • https://cdn.shopify.com/s/files/1/0435/2756/9576/files/informal_agents_of_social_control.pdf
    • https://cdn.shopify.com/s/files/1/0430/9378/6791/files/xogagativewofemuxow.pdf
    • https://cdn.shopify.com/s/files/1/0430/8343/2096/files/xaponutenojofipor.pdf
    • https://cdn.shopify.com/s/files/1/0443/8743/4662/files/aghanashini_river_information.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_off00007186.bin
59185cf30426867f52868f0b789ee19b9c65ffdb43f9eb4925087cb369006216
pdf-font-stream PDF embedded font (sfnt) at offset 0x7186 5160 bytes
font_01_sfnt_off000082fc.bin
3ee35f3428ca891d238ff8578358b08e808b250ec799b809302fed7b672c6b8e
pdf-font-stream PDF embedded font (sfnt) at offset 0x82FC 9928 bytes