Malicious PDF — malware analysis report

Static analysis result for SHA-256 184968dec28df0b3…

MALICIOUS

PDF

42.9 KB Created: 2020-08-13 06:15:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b642018b71d298521d3e4f644f4baac9 SHA-1: d76e332668ecb6ff502df8ec0366e51a641ffcf0 SHA-256: 184968dec28df0b35323f9e09f971eb40f5f1980a0901fb76ac933b19840dec9
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to a redirector service designed to obscure the final destination. The primary lure appears to be "Chegg solutions free pdf", suggesting a phishing or scam attempt. The ML classifier strongly indicated maliciousness, and the presence of a redirector URL confirms a malicious intent to lead the user 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=chegg+solutions+free+pdf
    • http://fixoxabog.holisticwellnessny.com/uploads/1/3/0/8/130874633/7868057.pdf
    • http://files.broadwaysilkens.com/uploads/1/3/0/7/130775002/4432974.pdf
    • http://sudizewa.stephlovesfitness.com/uploads/1/3/1/6/131606346/3160142.pdf
    • http://files.god4ce.com/uploads/1/3/1/6/131637419/08aef60b8acee.pdf
    • http://duwoxuri.myyearofhugs.com/uploads/1/3/1/1/131164406/tixapakex.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0439/9464/4638/files/autodesk_sketchbook_android_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0433/6805/4949/files/sweet_apple_acres.pdf
    • https://cdn.shopify.com/s/files/1/0436/3078/8758/files/forever_young_jay_z_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0433/9000/9502/files/academic_writing_course_outline.pdf
    • https://cdn.shopify.com/s/files/1/0430/8713/4882/files/27693947906.pdf
    • https://cdn.shopify.com/s/files/1/0432/0103/6443/files/wubegudadarojuwopa.pdf
    • https://cdn.shopify.com/s/files/1/0431/7426/4996/files/94402189445.pdf
    • https://cdn.shopify.com/s/files/1/0437/6212/2903/files/84816499669.pdf
    • https://cdn.shopify.com/s/files/1/0428/0716/5095/files/advanced_wastewater_treatment_book.pdf
    • https://cdn.shopify.com/s/files/1/0432/6778/4864/files/tatodewobefo.pdf
    • https://cdn.shopify.com/s/files/1/0437/6153/3089/files/kunenejutabekotibi.pdf
    • https://cdn.shopify.com/s/files/1/0430/1206/3391/files/nerusuworigilipavidelo.pdf
    • https://cdn.shopify.com/s/files/1/0432/0156/0737/files/84260631858.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_off00006c2e.bin
f1228e3dc1a1732e3197f1d4772ff9955da8e2f8f259ce0e4b6cc76939e8b052		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C2E 4996 bytes
font_01_sfnt_off00007d27.bin
30b2c0ff923fddf417c664508b25fa4cf7dd32c484e147924b80e6adba2f9e60		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D27 9976 bytes

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