Malicious PDF — malware analysis report

Static analysis result for SHA-256 70d812a7305e87fa…

MALICIOUS

PDF

44.7 KB Created: 2020-08-19 08:03:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7be12069640cc3596f0638b905efa4da SHA-1: fb207ff448e9e227a8523a375f8696ce72f9f977 SHA-256: 70d812a7305e87fa28be86fb3ca842a3c01533b18954f9493253bb841b571435
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm of numerous PDF files hosted on Shopify and other domains, with one primary link pointing to a known malicious redirector. This suggests an attempt to manipulate search engine results or lure users to malicious content. No scripts were extracted, and the document body is heavily obfuscated, limiting further analysis of specific payloads.

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=b+tech+information+technology+salary+per+month
    • http://files.gatewaychristiancoop.com/uploads/1/3/2/6/132682851/2510502.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0430/9454/0452/files/253208758.pdf
    • https://cdn.shopify.com/s/files/1/0429/1877/2903/files/29170701797.pdf
    • https://cdn.shopify.com/s/files/1/0438/1822/1730/files/descargar_cancionero_cristiano_gratis.pdf
    • https://cdn.shopify.com/s/files/1/0431/8530/7810/files/22096883717.pdf
    • https://cdn.shopify.com/s/files/1/0429/3869/5846/files/69901378576.pdf
    • https://cdn.shopify.com/s/files/1/0437/6631/7205/files/sinibilozumugijugemo.pdf
    • https://cdn.shopify.com/s/files/1/0437/6346/6391/files/53232001341.pdf
    • https://cdn.shopify.com/s/files/1/0436/0683/5358/files/android_apps_free_apk_sites.pdf
    • https://cdn.shopify.com/s/files/1/0433/1179/2286/files/videoder_indir_apk.pdf
    • https://cdn.shopify.com/s/files/1/0434/0921/1549/files/47702057537.pdf
    • https://cdn.shopify.com/s/files/1/0434/6200/0806/files/98110776829.pdf
    • https://cdn.shopify.com/s/files/1/0437/8044/0213/files/interview_skills_activity_sheet.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000637a.bin
ec87d90a9064f63c3d84cf7ae5c0a01f29d26be6e6096296b8a000f6d7009987
pdf-font-stream PDF embedded font (sfnt) at offset 0x637A 5368 bytes
font_01_sfnt_off00007586.bin
d4049cc4ee740bc1bab85fba349c5497700c3f0f26a83d7433fa7a13b7ed63f6
pdf-font-stream PDF embedded font (sfnt) at offset 0x7586 9968 bytes
font_02_sfnt_off000097b1.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f
pdf-font-stream PDF embedded font (sfnt) at offset 0x97B1 4324 bytes