Malicious PDF — malware analysis report

Static analysis result for SHA-256 85bc09fbbb302c7a…

MALICIOUS

PDF

38.4 KB Created: 2020-08-12 07:07:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0fde3703782398a09d11ddb733091ddd SHA-1: f1f37f3d7f644ca578023e49ab6b83a2602c0d12 SHA-256: 85bc09fbbb302c7af6ad8447baae8fddf018edd8550a04068c04e5007e03bff0
152 Risk Score

Malware Insights

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

The PDF contains a deceptive document body and embedded links. A critical heuristic identified a PDF link to known malicious redirector infrastructure, specifically `https://ttraff.cc/pify?keyword=cambridge+primary+science+stage+1+activity+book+pdf`. This indicates the document is designed to redirect users to malicious sites, likely for further exploitation or phishing. The presence of a large number of external PDF links, many hosted on Shopify, suggests a link farm or SEO poisoning tactic to increase visibility.

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.cc/pify?keyword=cambridge+primary+science+stage+1+activity+book+pdf
    • http://files.midwestbooksellers.org/uploads/1/3/2/6/132681670/juruj.pdf
    • http://files.chikuniradiozm.org/uploads/1/3/1/4/131453325/e23b5364c.pdf
    • http://xapizaxax.joanneboston.net/uploads/1/3/1/3/131398140/zuzujuxefoxamako.pdf
    • https://cdn.shopify.com/s/files/1/0429/0389/6217/files/browning_22_auto.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/wopesutokuvikoku.pdf
    • https://cdn.shopify.com/s/files/1/0433/6926/7354/files/norudutonigo.pdf
    • https://cdn.shopify.com/s/files/1/0438/1645/2258/files/21614280997.pdf
    • https://cdn.shopify.com/s/files/1/0437/7313/2954/files/aptitude_test_tips_and_tricks.pdf
    • https://cdn.shopify.com/s/files/1/0430/1930/5113/files/43146559201.pdf
    • https://cdn.shopify.com/s/files/1/0432/7368/3100/files/nurafufojox.pdf
    • https://cdn.shopify.com/s/files/1/0431/7757/4562/files/kuselixawidedub.pdf
    • https://cdn.shopify.com/s/files/1/0436/7797/4678/files/schmitt_political_theology.pdf
    • https://cdn.shopify.com/s/files/1/0427/7141/5196/files/kawajokevudolipol.pdf
    • https://cdn.shopify.com/s/files/1/0431/7364/2389/files/letipazisu.pdf
    • https://cdn.shopify.com/s/files/1/0427/9923/5228/files/80489693116.pdf
    • https://cdn.shopify.com/s/files/1/0429/9164/8929/files/materi_tentang_amdal.pdf
    • https://cdn.shopify.com/s/files/1/0436/5549/5833/files/master_tung_acupuncture.pdf
    • https://cdn.shopify.com/s/files/1/0433/7867/1779/files/88977512862.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_off00005539.bin
c43629008f9d8924cf39d9a44afb5c53eecb06e2aefdae59ee3d190c25bd976a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5539 5764 bytes
font_01_sfnt_off000068e0.bin
aebbf3970f8b4d1fad75fa9c3effa2c2661be2e5c5d973280952824d18d9f773		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68E0 10396 bytes

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