Malicious PDF — malware analysis report

Static analysis result for SHA-256 a480728df40f2c39…

MALICIOUS

PDF

33.2 KB Created: 2020-09-18 00:14:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fcac0a223d0315302e3acc5532aaa60d SHA-1: 02bbcc11264254b4049a57791c47629678fab39c SHA-256: a480728df40f2c39e29977ef74ff3f8ffdd369ce2da49f57ab7d0bc44a3497ac
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with several pointing to known malicious redirector infrastructure and link farms. The document body, though heavily obfuscated, contains text and URLs that align with the heuristic findings of a malicious redirector and a PDF link farm. This suggests the primary goal is to direct users to potentially harmful external websites, possibly for phishing or malware distribution.

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.me/wix?keyword=cracking+the+tech+career+filetype+pdf
    • http://files.powerofbankinginyourhands.com/uploads/1/3/1/4/131406663/gixokufowole.pdf
    • http://xabiroto.briarmere.co.uk/uploads/1/3/0/7/130739088/muromeneg.pdf
    • http://bifasure.camilletownshend.com/uploads/1/3/1/4/131483281/mugaku.pdf
    • http://duwexu.youcee.eu/uploads/1/3/1/3/131397971/6073609.pdf
    • http://zuwepub.itsthabom.com/uploads/1/3/1/0/131071164/6436801.pdf
    • https://56126304-bf18-44da-a863-86b490d45381.filesusr.com/ugd/18122d_c70dd3263bf74c9fa4c3ecf034af7f26.pdf?index=true
    • https://3fd1f565-ab96-4336-b5ad-30e95c5ce1c0.filesusr.com/ugd/38062a_abd98c05ecc940bb812abd1fe19dc410.pdf?index=true
    • https://ed994de9-21ce-444b-a668-33963e18ed09.filesusr.com/ugd/011e4b_f834d14715e54daeb07e2f8d4ae9abcb.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0434/0459/1271/files/2273397474.pdf
    • https://cdn.shopify.com/s/files/1/0432/3016/7202/files/81143907709.pdf
    • https://cdn.shopify.com/s/files/1/0433/4898/3959/files/hp_officejet_4500_manual.pdf
    • https://cdn.shopify.com/s/files/1/0437/9089/3213/files/also_holding_annual_report.pdf
    • https://cdn.shopify.com/s/files/1/0435/2314/5896/files/alimentacion_y_nutricion_en_edad_escolar.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_off0000453d.bin
f346f9cff35a28b4eebc90833bc84ddddf8f40723ee100e282dafdb52b97fc89
pdf-font-stream PDF embedded font (sfnt) at offset 0x453D 5312 bytes
font_01_sfnt_off00005754.bin
8653d8f2eb63eca816c5610b3e8e4bec2c1692fe2cdd38e5f1fd2ba2497ded54
pdf-font-stream PDF embedded font (sfnt) at offset 0x5754 9624 bytes