Malicious PDF — malware analysis report

Static analysis result for SHA-256 65a1dd136591e731…

MALICIOUS

PDF

48.9 KB Created: 2020-07-24 11:15:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9fa7b1017490d4acd09dd52b2ba3ac31 SHA-1: 95af444081e6a0c93ca9db2fb6e3243ebc81c1c7 SHA-256: 65a1dd136591e731d80654ec3c18e0e511d6e66e70ca5f7bee4ec2a06c22d706
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one heuristic specifically identifying it as a PDF link farm. The primary redirector URL, 'https://ttraff.com/wb?keyword=cie%2010%20enfermedades%20mentales%20pdf', is flagged as malicious. While no scripts were explicitly extracted, the presence of numerous links suggests an attempt to lure users to external, potentially malicious, sites, aligning with phishing or SEO spam tactics.

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.com/wb?keyword=cie%2010%20enfermedades%20mentales%20pdf
    • http://files.ildiamon.com/uploads/1/3/0/9/130969705/rozozitode.pdf
    • http://files.nickseifert.com/uploads/1/3/1/6/131606222/2221880.pdf
    • http://files.txtorches.com/uploads/1/3/0/7/130775776/376dea.pdf
    • http://files.robbielee-illustrator.com/uploads/1/3/1/1/131164252/9877543.pdf
    • http://files.thedragonshoard.net/uploads/1/3/1/1/131164275/midabopakev.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/5074/5512/files/83205912761.pdf
    • https://cdn.shopify.com/s/files/1/0430/7877/9029/files/rebekuxusob.pdf
    • https://cdn.shopify.com/s/files/1/0430/8451/3444/files/96391719920.pdf
    • https://cdn.shopify.com/s/files/1/0437/4393/6673/files/takijenewarerozipo.pdf
    • https://cdn.shopify.com/s/files/1/0434/3431/1845/files/61303888641.pdf
    • https://cdn.shopify.com/s/files/1/0432/5149/9170/files/nepotobemejanegepunoduv.pdf
    • https://cdn.shopify.com/s/files/1/0433/5380/0859/files/83651687101.pdf
    • https://cdn.shopify.com/s/files/1/0431/8304/6813/files/letupimibezikuvoku.pdf
    • https://cdn.shopify.com/s/files/1/0429/0510/8636/files/lijupumufugedalisujorafa.pdf
    • https://cdn.shopify.com/s/files/1/0430/7196/3296/files/vubaforavidoxunomavi.pdf
    • https://cdn.shopify.com/s/files/1/0434/9706/2564/files/90054787945.pdf
    • https://cdn.shopify.com/s/files/1/0435/5496/3617/files/buwikinowitizojoginoxevi.pdf
    • https://cdn.shopify.com/s/files/1/0431/8609/4241/files/suvogudigagaberidada.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_off00008166.bin
dcbe29b2e5fd675673e1f93aa8666a6aa26ed855dbe105bd8275f51c8d1a5b49		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8166 5080 bytes
font_01_sfnt_off0000928e.bin
281687127471bff309ea26a74e17a24dcd75fc5993d25600f4c37b5936135600		 pdf-font-stream PDF embedded font (sfnt) at offset 0x928E 10436 bytes

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