Malicious PDF — malware analysis report

Static analysis result for SHA-256 16dac61e1303ce62…

MALICIOUS

PDF

52.7 KB Created: 2020-08-23 08:22:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c74293324caf01116b176e767a73d724 SHA-1: 2f61a557221b8ec971638af36ddbd8ac2b11ae92 SHA-256: 16dac61e1303ce6238b48c6c4ae8b6f7d341417cba7c66c063754af0ece8609a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a large number of embedded links, many pointing to what appears to be a link farm designed for SEO manipulation. One prominent URL, 'https://ttraff.ru/pify?keyword=consumer+reports+washer+dryer+combo', is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. This suggests the document's primary purpose is to redirect users to malicious infrastructure, likely for phishing or to serve further 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.ru/pify?keyword=consumer+reports+washer+dryer+combo
    • http://files.habitatgpmc.org/uploads/1/3/0/9/130969710/0bb9ab66.pdf
    • http://files.solarconsumeradvisor.com/uploads/1/3/0/9/130968933/8040831.pdf
    • http://files.bow4290.org/uploads/1/3/0/7/130775567/kevasobupulofupu.pdf
    • http://kudas.miraclecreations.shop/uploads/1/3/0/9/130969742/3991400.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/5580/0739/files/nosokurowokoluzo.pdf
    • https://cdn.shopify.com/s/files/1/0436/9943/7721/files/bbg_training_guide.pdf
    • https://cdn.shopify.com/s/files/1/0432/4786/1923/files/xafififosupo.pdf
    • https://cdn.shopify.com/s/files/1/0440/7469/6856/files/auto_id_card_format.pdf
    • https://cdn.shopify.com/s/files/1/0430/3690/1527/files/nojitif.pdf
    • https://cdn.shopify.com/s/files/1/0437/3331/9831/files/63463616377.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tipibag.pdf
    • https://cdn.shopify.com/s/files/1/0433/2450/6266/files/breakthrough_thinking_thomas_vogel.pdf
    • https://cdn.shopify.com/s/files/1/0429/3961/3347/files/telugu_bible_concordance_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/7224/9251/files/emotional_intelligence_test_printable.pdf
    • https://cdn.shopify.com/s/files/1/0434/4119/3110/files/fudewopabufav.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_off00009055.bin
fe6774ae067499407a66a0f5751e6f78514394dd2f70b624f6ad9a854203d6fb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9055 5520 bytes
font_01_sfnt_off0000a2f6.bin
e501774a8b9acde3a7463828c6aa905ab090567c4abdd634178e3f6e0d36e142		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA2F6 10112 bytes

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