Malicious PDF — malware analysis report

Static analysis result for SHA-256 06d4fb447ef1c73f…

MALICIOUS

PDF

46.9 KB Created: 2020-08-18 19:02:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 54c6dec984cb4a6c7b4f085733a4a661 SHA-1: 6b0229d9f3fc7a2882af434622eaf32c8d6169be SHA-256: 06d4fb447ef1c73fc2e61a7d5325bb43c38bb4c07d72cfb346713731cb7dd079
194 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to a link farm designed to distribute further malicious content. The document body, though obfuscated, contains URLs that are likely part of a phishing or malware distribution scheme. The presence of a malicious redirector link and a high ML score strongly indicate 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=ios+fresher+interview+questions+and+answers+pdf
    • http://files.analyticalinstrumentservicecompany.com/uploads/1/3/1/3/131383791/5f99d.pdf
    • http://files.matomar.com/uploads/1/3/1/4/131438776/zogoforapuzazi.pdf
    • http://xemivixo.aglimpseofhues.com/uploads/1/3/1/3/131378950/6245537.pdf
    • http://nowulu.orlandocitypasta.com/uploads/1/3/1/4/131408738/gonirejake.pdf
    • http://lolax.yatom.org/uploads/1/3/2/8/132814930/wexenekibonelakuj.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/8004/6997/files/6752379492.pdf
    • https://cdn.shopify.com/s/files/1/0435/8206/2753/files/fapilepidevekorurebowof.pdf
    • https://cdn.shopify.com/s/files/1/0440/5755/9190/files/tesumipomusiju.pdf
    • https://cdn.shopify.com/s/files/1/0428/3963/8179/files/89681586279.pdf
    • https://cdn.shopify.com/s/files/1/0430/5358/0439/files/20715897091.pdf
    • https://cdn.shopify.com/s/files/1/0438/8788/6488/files/26991320810.pdf
    • https://cdn.shopify.com/s/files/1/0433/6353/2951/files/manual_cade_simu.pdf
    • https://cdn.shopify.com/s/files/1/0428/8030/3270/files/muzebijegigesut.pdf
    • https://cdn.shopify.com/s/files/1/0449/8318/9662/files/77252008565.pdf
    • https://cdn.shopify.com/s/files/1/0427/7954/1671/files/57936892783.pdf
    • https://cdn.shopify.com/s/files/1/0439/2520/9256/files/48097750610.pdf
    • https://cdn.shopify.com/s/files/1/0428/8249/8716/files/febevozovunu.pdf
    • https://cdn.shopify.com/s/files/1/0431/5149/1236/files/dimasibomikekenano.pdf
    • https://cdn.shopify.com/s/files/1/0432/5225/2829/files/ragulu.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_off0000777f.bin
c67c651cd24f471f5e2699a1509a25c15a0de3f40995232197d5d941645b7337		 pdf-font-stream PDF embedded font (sfnt) at offset 0x777F 5312 bytes
font_01_sfnt_off0000899a.bin
c8f5b62c440b253b77d4d0d0737b4bfef3b19874e0de798b4f0c84187541cccf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x899A 10776 bytes

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