Malicious PDF — malware analysis report

Static analysis result for SHA-256 28a575f58a7dddc8…

MALICIOUS

PDF

38.2 KB Created: 2020-08-31 13:48:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bf0f9eea46cd471e77a0794e2fef5871 SHA-1: a63acdb0abc0b75833fff394569086a768097896 SHA-256: 28a575f58a7dddc8b5d0920fcb1e8e2439ad775743e837d631dc5bb0217f9661
150 Risk Score

Malware Insights

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

The PDF was flagged as malicious by an ML classifier and contains a link farm of external PDF links. One of these links, 'https://ttraff.com/pify?keyword=performance+evaluation+meaning+in+hr', points to a known malicious redirector. The document body contains garbled text but includes the URL for the redirector, suggesting a lure to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=performance+evaluation+meaning+in+hr
    • https://cdn.shopify.com/s/files/1/0431/4336/4759/files/lbs_mba_employment_report_2017.pdf
    • https://cdn.shopify.com/s/files/1/0438/3349/1613/files/porujep.pdf
    • https://cdn.shopify.com/s/files/1/0450/4079/5806/files/english_prefixes_and_suffixes_practice_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0431/2619/4333/files/kofez.pdf
    • https://cdn.shopify.com/s/files/1/0432/7142/2102/files/urban_dictionary_lemon.pdf
    • https://static.usrfiles.com/ugd/d63aaf_6174b0e65cfe458faa81097cc934a09b.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/96672573922.pdf
    • https://cdn.shopify.com/s/files/1/0432/7574/7484/files/alef_paulo_koeljo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/67768868558.pdf
    • https://cdn.shopify.com/s/files/1/0461/9907/9065/files/gta_san_andreas_sigara_ime_ifresi.pdf
    • https://cdn.shopify.com/s/files/1/0432/9222/9787/files/35853224706.pdf
    • https://cdn.shopify.com/s/files/1/0431/7151/2480/files/tituxuligofanisutama.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_off0000596e.bin
405969758249dcdd251aa119b787da58e6a0e1472e4d93a406241c4d3ad4bfe3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x596E 5176 bytes
font_01_sfnt_off00006ae5.bin
fea9d542b3185979e5fac3c3c3047cb2020dc01a36cac5f42c8e75e0cfbb2fa2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6AE5 9804 bytes

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