Malicious PDF — malware analysis report

Static analysis result for SHA-256 69d6bb8d0cc42738…

MALICIOUS

PDF

35.8 KB Created: 2020-07-31 16:50:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 198fe41599ca0f283744a0b12c5e72bf SHA-1: c449a2d0a65c6481025313150709201c56d9e0e0 SHA-256: 69d6bb8d0cc42738d45e4edb9a0caba63c681deba9c671173886c23a0d1acb8a
194 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files, a technique often used for SEO manipulation or to distribute further malicious content. One critical heuristic identified a link to known malicious redirector infrastructure at https://ttraff.com/pify?keyword=lowes+vincennes+indiana. The ML classifier also strongly indicated maliciousness. While no scripts were extracted, the sheer volume of links and the presence of a malicious redirector suggest a high likelihood of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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=lowes+vincennes+indiana
    • http://files.samcozzi.com/uploads/1/3/0/7/130739747/xituvaje.pdf
    • http://files.lindseyauman.com/uploads/1/3/1/0/131069934/xedewotu_fewedorutatevax_notasum_mekapuranew.pdf
    • http://files.crossroadsbiblecollegeandseminary.com/uploads/1/3/1/3/131381612/jabuxijifafaf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0440/7135/4533/files/carson_dellosa_math_5th_grade_pdf.pdf
    • https://cdn.shopify.com/s/files/1/0434/3031/4151/files/62586958085.pdf
    • https://cdn.shopify.com/s/files/1/0438/1281/5010/files/46001745735.pdf
    • https://cdn.shopify.com/s/files/1/0431/0928/6050/files/13214642328.pdf
    • https://cdn.shopify.com/s/files/1/0429/1392/3228/files/22648825065.pdf
    • https://cdn.shopify.com/s/files/1/0430/7494/5184/files/3872918083.pdf
    • https://cdn.shopify.com/s/files/1/0433/4521/5656/files/37034765106.pdf
    • https://cdn.shopify.com/s/files/1/0428/4763/3575/files/47317924325.pdf
    • https://cdn.shopify.com/s/files/1/0440/2351/3238/files/burexad.pdf
    • https://cdn.shopify.com/s/files/1/0432/6942/3269/files/91975956545.pdf
    • https://cdn.shopify.com/s/files/1/0434/4607/5542/files/xaduduruzatamumafal.pdf
    • https://cdn.shopify.com/s/files/1/0435/0600/8216/files/jonunatawufekanolava.pdf
    • https://cdn.shopify.com/s/files/1/0428/9275/5103/files/6548860022.pdf
    • https://cdn.shopify.com/s/files/1/0430/6056/0021/files/30962514966.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_off00004ebb.bin
f3d0e7c51a1134ef715803ddf9102ee6e7b2669a72c9b659fef60cb043601825		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4EBB 4900 bytes
font_01_sfnt_off00005f94.bin
9ea3a7277f9ed06741c4ee564613e9133b332c57c08fab5ed6fe21e9d1bd952a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F94 10128 bytes

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