Malicious PDF — malware analysis report

Static analysis result for SHA-256 940f0a5a8ac4718a…

MALICIOUS

PDF

38.6 KB Created: 2020-08-20 08:26:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1a8e031fc41f8d9b921c91dc3fd151ab SHA-1: affcfecfd8a631c4bf87e29d8758f19205d6cdba SHA-256: 940f0a5a8ac4718aaac202cb726c0b89f403692e6e22235a432fb2f7e0aeaaa9
152 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/pify?keyword=american+football+uniforms+for+sale'. This indicates the document's primary purpose is to redirect users to malicious infrastructure. The PDF also contains a large number of external links, suggesting a link farm or SEO poisoning tactic. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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=american+football+uniforms+for+sale
    • http://files.chrisremitzcpa.com/uploads/1/3/1/4/131406234/gajifezumeno-sipisebakep-janekuxibanowad.pdf
    • https://cdn.shopify.com/s/files/1/0440/6748/7894/files/list_of_behavioral_interview_questions.pdf
    • https://cdn.shopify.com/s/files/1/0430/5901/9933/files/assay_of_chlorpromazine_by_non_aqueous_titration.pdf
    • https://cdn.shopify.com/s/files/1/0428/8102/4159/files/mojorilawaf.pdf
    • https://cdn.shopify.com/s/files/1/0434/6707/9830/files/free_disposable_email_address.pdf
    • https://cdn.shopify.com/s/files/1/0431/1567/5815/files/children_of_the_corn_devil_shyt_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0432/0349/4043/files/milobejusetumu.pdf
    • https://cdn.shopify.com/s/files/1/0439/0351/6827/files/69877681376.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_off00005792.bin
779d73e3dc0b220aebca6cb435220294d2d4b1ce7dbea54c5efb68d7b2b9378d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5792 5156 bytes
font_01_sfnt_off000068f7.bin
04c1289c2701428bca4438853a0205c9351724fd7b024b15b49deb662322874c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68F7 10892 bytes

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