Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b807397af80c081…

MALICIOUS

PDF

39.3 KB Created: 2020-08-07 04:48:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2b615e9a3e7a81bbc53acd99c2a6f176 SHA-1: cb6a191412b1f3aa775eff3feb472d73fba41dec SHA-256: 2b807397af80c081a48ec9a87735a776ae36077e218dfb88d2eb1f26791a080a
154 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, with at least one pointing to a known malicious redirector (ttraff.com). The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting an attempt to lure users to malicious or compromised content. The ML classifier also strongly flagged this PDF as malicious. The document body itself is largely unreadable, but the presence of the URL in the body and the link farm heuristics strongly suggest a phishing or redirection attack.

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/pify?keyword=agroecologia+concepto+pdf
    • http://files.queenofcards1111.com/uploads/1/3/0/8/130874067/ravuteruruze-visizumo-ropuf.pdf
    • http://files.techviews.online/uploads/1/3/2/6/132680813/loxidemigimogebegasa.pdf
    • http://files.mssimonsays.org/uploads/1/3/1/4/131453106/8448709.pdf
    • https://cdn.shopify.com/s/files/1/0432/6188/6627/files/mixubirekisoxiwelu.pdf
    • https://cdn.shopify.com/s/files/1/0430/4610/9345/files/gepoxefaj.pdf
    • https://cdn.shopify.com/s/files/1/0433/2378/5370/files/28793765081.pdf
    • https://cdn.shopify.com/s/files/1/0434/8382/4294/files/loxolimegadojosefovurixix.pdf
    • https://cdn.shopify.com/s/files/1/0444/0326/1606/files/hole_s_human_anatomy_and_physiology_10th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0434/7808/9878/files/cardiac_muscle_contraction.pdf
    • https://cdn.shopify.com/s/files/1/0438/1478/1088/files/83184508191.pdf
    • https://cdn.shopify.com/s/files/1/0430/8559/4775/files/93816262634.pdf
    • https://cdn.shopify.com/s/files/1/0428/8380/9439/files/mulonezunakos.pdf
    • https://cdn.shopify.com/s/files/1/0431/4251/2791/files/biographies_for_3rd_graders.pdf
    • https://cdn.shopify.com/s/files/1/0436/3137/8590/files/26483728712.pdf
    • https://cdn.shopify.com/s/files/1/0433/4537/9478/files/35278316977.pdf
    • https://cdn.shopify.com/s/files/1/0429/2601/4630/files/20055972470.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_off00005e07.bin
339400f9123e877614c7dfb0cc3ce2cc59935d71db4a9391717227d5ce0095ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E07 5136 bytes
font_01_sfnt_off00006f96.bin
21bcf1a46730fb5fdf187161b741fd502d261269e8c2c6ecff31725275fd2285		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F96 9636 bytes

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