Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bf3329708cf230e…

MALICIOUS

PDF

42.3 KB Created: 2020-08-22 05:58:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d8a29483e94eaa799616c8962bf014ec SHA-1: 76f08b561ff1104044f64fedb40da4978d9e4714 SHA-256: 4bf3329708cf230e98f3ecf365690b100eef6df604b987815de0560735381e3e
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to what appears to be a link farm designed for SEO manipulation. One critical heuristic identified a link to a known malicious redirector, ttraff.cc, which is likely intended to lead the user to a malicious site. The document body, though heavily obfuscated, contains the same URL as the malicious redirector, reinforcing the attack vector. No scripts were extracted, and the primary malicious activity appears to be link-based redirection.

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/pify?keyword=biotechnology+projects+for+class+12th+pdf
    • http://zulazu.priscillaventurablog.com/uploads/1/3/1/3/131380213/sajazojola.pdf
    • http://xiwoz.fixfonezfast.com/uploads/1/3/2/8/132814930/vasopiliraman.pdf
    • http://kabuj.clearcreekbands.com/uploads/1/3/0/7/130776436/7f89d5.pdf
    • http://files.dpmine.com/uploads/1/3/0/8/130874599/6140404.pdf
    • https://cdn.shopify.com/s/files/1/0437/6264/7192/files/capital_structure_and_financial_offering_example.pdf
    • https://cdn.shopify.com/s/files/1/0430/9411/4457/files/68130920130.pdf
    • https://cdn.shopify.com/s/files/1/0432/1063/7475/files/jalapokibu.pdf
    • https://cdn.shopify.com/s/files/1/0433/9433/4870/files/scrum_guide.pdf
    • https://cdn.shopify.com/s/files/1/0431/1583/9645/files/67675299261.pdf
    • https://cdn.shopify.com/s/files/1/0437/0602/4101/files/dnd_5e_cause_fear.pdf
    • https://cdn.shopify.com/s/files/1/0428/3236/3676/files/68921958612.pdf
    • https://cdn.shopify.com/s/files/1/0436/8809/9993/files/apeman_dash_cam_c450_manual.pdf
    • https://cdn.shopify.com/s/files/1/0457/0382/3516/files/icse_10th_exam_date_sheet_2019.pdf
    • https://cdn.shopify.com/s/files/1/0434/6901/3144/files/xolibimesupofiwugiruxut.pdf
    • https://cdn.shopify.com/s/files/1/0430/3932/6365/files/science_grading_sheet_deped.pdf
    • https://cdn.shopify.com/s/files/1/0428/1332/5471/files/ikea_bekant_desk.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_off0000662c.bin
1ffed1c370397653d20705dda012fe3e6720887e6f6361f9ab4e656039994aa4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x662C 5828 bytes
font_01_sfnt_off00007a06.bin
4247793d44cbfe67646fb79d6e68b267767304abae63c361bf84e51ac4b88a37		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A06 10040 bytes

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