Malicious PDF — malware analysis report

Static analysis result for SHA-256 141552e51b098f2a…

MALICIOUS

PDF

40.2 KB Created: 2020-08-03 06:50:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 671773c372963f1ff7033d0a257ac933 SHA-1: 46d79a764d4678d6bc38adf2b852238e6167f734 SHA-256: 141552e51b098f2af128020fc9796350f0b81a88e33b8053ca92c3be0a64838e
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically the URL https://ttraff.cc/wb?keyword=placenta%20previa%20tratamiento%20pdf. Additionally, it features a large number of external PDF links, suggesting a link farm or SEO manipulation tactic. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the embedded links and the nature of the heuristics indicate a malicious intent to redirect users to harmful sites.

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/wb?keyword=placenta%20previa%20tratamiento%20pdf
    • http://files.peggriffith.com/uploads/1/3/0/7/130740367/7fb79.pdf
    • http://files.isabelcalkins.com/uploads/1/3/1/4/131453111/niwivimol_tedanur_bapila.pdf
    • http://files.metalexpressions.com/uploads/1/3/0/9/130969525/4140703.pdf
    • http://files.busylilbeefloral.com/uploads/1/3/1/6/131606346/9a9f3b.pdf
    • http://files.unfinishededucation.com/uploads/1/3/0/9/130969992/453ae9bf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/7750/0056/files/west_virginia_university_physics.pdf
    • https://cdn.shopify.com/s/files/1/0427/9166/5830/files/25488501313.pdf
    • https://cdn.shopify.com/s/files/1/0437/3449/9493/files/68553016156.pdf
    • https://cdn.shopify.com/s/files/1/0428/5385/9494/files/ios_10_emojis_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/0252/7895/files/84840710325.pdf
    • https://cdn.shopify.com/s/files/1/0434/7746/7288/files/tilexafadoxiwafilurujojib.pdf
    • https://cdn.shopify.com/s/files/1/0433/3525/4171/files/luriwageregasadobajoro.pdf
    • https://cdn.shopify.com/s/files/1/0433/9925/0072/files/pepiduvigirabi.pdf
    • https://cdn.shopify.com/s/files/1/0441/0900/4952/files/d_d_3._5_complete_psionic.pdf
    • https://cdn.shopify.com/s/files/1/0431/0119/2352/files/mixibodidodejabizat.pdf
    • https://cdn.shopify.com/s/files/1/0450/4076/3030/files/code_alarm_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/8658/5749/files/togada.pdf
    • https://cdn.shopify.com/s/files/1/0431/2721/0144/files/wimimuketos.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_off00005f17.bin
34c7e609dceae73736ba84e9455d5425bd33849e149c2e967478ddc12904a297		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F17 5184 bytes
font_01_sfnt_off000070ae.bin
ad653b5667b6b045055a48a3bae1292710b2f8d080e7141bcc7ad03954af93a4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70AE 10332 bytes

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