Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c0c57723f52c2bc…

MALICIOUS

PDF

52.9 KB Created: 2020-07-22 05:06:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 13698dc9f3e7bf30318b28b525551fdb SHA-1: 050e18a56dd2f746e0ee76a27612c714a405e0c0 SHA-256: 1c0c57723f52c2bc886e7b735a032687ca8d6888cedd6b82ae28e8b7395d26bc
152 Risk Score

Malware Insights

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

The PDF was flagged as malicious by a machine learning classifier and contains numerous embedded links. One critical heuristic identified links pointing to known malicious redirector infrastructure, specifically 'ttraff.com'. Another critical heuristic noted a large number of external PDF links, suggesting a link farm or SEO poisoning tactic. While no scripts were extracted, the sheer volume of links and the redirection to malicious infrastructure strongly indicate a malicious intent, likely to lure users to harmful websites.

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=leer%20sensacional%20de%20barrios%20pdf
    • http://files.radtkebasstrail.com/uploads/1/3/1/3/131379622/1579511.pdf
    • http://files.smarterbites.org/uploads/1/3/1/4/131453869/63b20a13.pdf
    • http://files.waynehousingcoalition.org/uploads/1/3/1/3/131398097/97e3c2068783a.pdf
    • http://files.tufproject.org/uploads/1/3/1/4/131437044/7955795.pdf
    • http://files.professorofpractice.com/uploads/1/3/0/8/130874240/8970a8.pdf
    • http://files.waynehousingcoalition.org/uploads/1/3/1
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/berujixawajibexuxutuzogar.pdf
    • https://cdn.shopify.com/s/files/1/0429/8499/7025/files/fuminawutigagurew.pdf
    • https://cdn.shopify.com/s/files/1/0435/1400/3610/files/41920035350.pdf
    • https://jexosatija.files.wordpress.com/2020/07/83974405291.pdf
    • https://jadulotixen.files.wordpress.com/2020/06/sisodosepogorelili.pdf
    • https://porafofaj.files.wordpress.com/2020/07/gegezegeme.pdf
    • https://nodifewabala.files.wordpress.com/2020/07/25730360869.pdf
    • https://risuzonapi841266864.files.wordpress.com/2020/06/2131850714.pdf
    • https://cdn.shopify.com/s/files/1/0431/5663/5816/files/67461371573.pdf
    • https://cdn.shopify.com/s/files/1/0430/8199/0304/files/6751568566.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/56655156305.pdf
    • https://cdn.shopify.com/s/files/1/0433/4164/3928/files/luxaj.pdf
    • https://cdn.shopify.com/s/files/1/0430/4394/6649/files/27379196740.pdf
    • https://cdn.shopify.com/s/files/1/0437/1991/7717/files/17027069758.pdf
    • https://cdn.shopify.com/s/files/1/0435/7803/2296/files/98536874355.pdf
    • https://cdn.shopify.com/s/files/1/0435/3431/9776/files/kimegugunoz.pdf
    • https://cdn.shopify.com/s/files/1/0436/4750/0448/files/paxuzes.pdf
    • https://cdn.shopify.com/s/files/1/0432/2210/6271/files/wizakuziwidu.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_off00008dfa.bin
3cfc36a6bb3e1a3b8da44a5f3f2988aac87c80a193e4baf381a3af4726dcf2d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8DFA 4940 bytes
font_01_sfnt_off00009eb9.bin
0e218492b8365d91d9d9e6ac4eefca68c76cb0043d7452bf2e9f99ee44f3c6d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9EB9 11600 bytes

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