Malicious PDF — malware analysis report

Static analysis result for SHA-256 9681d84abcae0ffa…

MALICIOUS

PDF

42.3 KB Created: 2020-08-08 02:11:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 37f0801a1295470c7f912c433eabcebf SHA-1: a6775d76973def6ef323e262e1fa2e20a8162f23 SHA-256: 9681d84abcae0ffa1506a5334498b0de57544d906709b3daf53524fe310c99a8
152 Risk Score

Malware Insights

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

The PDF contains numerous links, including one to a known malicious redirector, suggesting a phishing or scam attempt. The document body itself appears to be a lure, referencing a PDF download related to academic English. The ML classifier strongly indicated maliciousness, and the presence of a link farm further supports a malicious intent to redirect users to potentially harmful content.

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=academic+english+reading+and+writing+across+the+disciplines+pdf+download
    • http://sodaju.familyfellowshipla.com/uploads/1/3/1/4/131453329/31ce2e6a2af1.pdf
    • http://files.abspate.com/uploads/1/3/0/8/130814534/8842399.pdf
    • http://gizimu.holistichealthdiy.com/uploads/1/3/1/4/131453541/papelaxofezilunaj.pdf
    • https://cdn.shopify.com/s/files/1/0435/4120/1064/files/11266091840.pdf
    • https://cdn.shopify.com/s/files/1/0437/3282/8314/files/water_resources_engineering_mays_2nd_edition.pdf
    • https://cdn.shopify.com/s/files/1/0436/9098/3574/files/gesopadoxusavawubewon.pdf
    • https://cdn.shopify.com/s/files/1/0429/6006/0567/files/59206012810.pdf
    • https://cdn.shopify.com/s/files/1/0431/3962/9218/files/manixajakaremibojiv.pdf
    • https://cdn.shopify.com/s/files/1/0435/5181/7883/files/xuxojuramupagepezapemasu.pdf
    • https://cdn.shopify.com/s/files/1/0437/0500/8282/files/xuveduxaditubane.pdf
    • https://cdn.shopify.com/s/files/1/0433/4996/6998/files/94708015503.pdf
    • https://cdn.shopify.com/s/files/1/0429/3630/3782/files/vegugaxiresemide.pdf
    • https://cdn.shopify.com/s/files/1/0431/2150/8506/files/nakuvatululupovokisuji.pdf
    • https://cdn.shopify.com/s/files/1/0428/4101/4438/files/zirekek.pdf
    • https://cdn.shopify.com/s/files/1/0432/5310/4790/files/15484350375.pdf
    • https://cdn.shopify.com/s/files/1/0435/6544/9365/files/rawap.pdf
    • https://cdn.shopify.com/s/files/1/0429/5720/9753/files/velaguwutelewazetejoga.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vemuvuferakodumi.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_off0000668b.bin
b1554be35664dc1f459bba86fad42bfd3bbca5b59317c3cf783119da9a6cacfe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x668B 5652 bytes
font_01_sfnt_off000079a7.bin
9eba5d8c0c62a7d8c207be5813fdc1b75e3b6632855b075a3d144ddbff5f56cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79A7 9964 bytes

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