Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b0bc6d0d2f90976…

MALICIOUS

PDF

43.8 KB Created: 2020-08-02 17:08:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6ee17d77a01329abe525570f4ca7acd4 SHA-1: 4900defa5547d915e343d4d35f3a3daff6f39bd1 SHA-256: 0b0bc6d0d2f9097676256d4cf5c7328fbccad7c0ca1cf4656eb6bd61ca49e0ec
198 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating malicious intent, including a critical finding for a redirector link to 'ttraff.cc' and a link farm of external PDFs. The document body, though partially corrupted, contains text suggesting a 'demand letter for unpaid rent' and includes the malicious URL. This pattern is consistent with phishing or malware distribution, where the initial document serves as a lure to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 8

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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/pify?keyword=sample+demand+letter+for+unpaid+rent
    • http://files.claytonpharm.com/uploads/1/3/0/7/130775462/vanozilex-rubarakojoturur-kesezobazebovun.pdf
    • http://xinifupa.eclexica.studio/uploads/1/3/2/3/132303035/jupebewowulumaw-ruxidur-dulobo.pdf
    • http://files.hummingbirdmedicineboise.com/uploads/1/3/1/6/131636903/milugirorokijakarip.pdf
    • http://files.susannawesleyumc.org/uploads/1/3/1/6/131637313/xabiwaga.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/8801/8598/files/57804612718.pdf
    • https://cdn.shopify.com/s/files/1/0432/8731/4590/files/fuluwekunekutijesivum.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/fesulemenakasisot.pdf
    • https://cdn.shopify.com/s/files/1/0436/7712/2713/files/kogodakapibameputonigi.pdf
    • https://cdn.shopify.com/s/files/1/0432/7332/2664/files/zetaboxiginumejaburo.pdf
    • https://cdn.shopify.com/s/files/1/0429/9299/2410/files/9582908457.pdf
    • https://cdn.shopify.com/s/files/1/0432/3078/9800/files/vubuwatoberozesofapilo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/2857609843.pdf
    • https://cdn.shopify.com/s/files/1/0433/6071/4904/files/74636496503.pdf
    • https://cdn.shopify.com/s/files/1/0432/2033/6807/files/numenejatupovomusiwasejij.pdf
    • https://cdn.shopify.com/s/files/1/0438/3650/6272/files/essentials_of_understanding_psychology_11th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0434/7658/2552/files/46535956644.pdf
    • https://cdn.shopify.com/s/files/1/0438/2598/7746/files/91063744463.pdf
    • https://cdn.shopify.com/s/files/1/0430/0839/3367/files/kanegojefolexu.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_off00006e8a.bin
aab00527cef6694edae27cfe6162d237db3d2d880e9cc99bdbc9c205609326f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E8A 5112 bytes
font_01_sfnt_off00007fd5.bin
a85a6e8457b40c70189eea246802ceeeb3e57964a7aba449447dd494a3169c8d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7FD5 10032 bytes

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