Malicious PDF — malware analysis report

Static analysis result for SHA-256 476935a8497cb842…

MALICIOUS

PDF

47.1 KB Created: 2020-07-22 12:00:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c7fe84abc58207ed5d62146605258023 SHA-1: 735739232959ca35d850a32a0f29bc05532cc29e SHA-256: 476935a8497cb8421f85966fbdc17cd09a1be42c69a02c6575734008e7aadfd6
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 of which point to a link farm hosted on cdn.shopify.com, and one critical link directs to a known malicious redirector at ttraff.cc. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, suggests a lure related to 'Areal differentiation in geography pdf'. The primary attack pattern involves redirecting users to malicious infrastructure via these embedded links.

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=areal+differentiation+in+geography+pdf
    • http://files.jewsforyeshua.com/uploads/1/3/0/8/130814601/4272748.pdf
    • http://files.oztriathlete.com/uploads/1/3/1/3/131383575/5675044.pdf
    • http://files.knightprideproductions.com/uploads/1/3/0/9/130969371/jipaxixodonanog.pdf
    • http://files.psychiatristsofsandiego.com/uploads/1/3/0/9/130969967/zorozakejevega-guzale-wobowo.pdf
    • https://cdn.shopify.com/s/files/1/0429/3872/8611/files/mafun.pdf
    • https://cdn.shopify.com/s/files/1/0431/5480/0802/files/sokikamirobawukunu.pdf
    • https://cdn.shopify.com/s/files/1/0431/7229/8913/files/metawosofojux.pdf
    • https://cdn.shopify.com/s/files/1/0438/5911/6182/files/soxavujewu.pdf
    • https://cdn.shopify.com/s/files/1/0427/6980/9564/files/38813686968.pdf
    • https://popazigi.files.wordpress.com/2020/07/94988636019.pdf
    • https://navurigafevu.files.wordpress.com/2020/06/16824415167.pdf
    • https://fovuweba408505925.files.wordpress.com/2020/06/viruje.pdf
    • https://vufiwajemo.files.wordpress.com/2020/07/xogudatug.pdf
    • https://cdn.shopify.com/s/files/1/0432/5326/8642/files/39418724794.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/32829552166.pdf
    • https://cdn.shopify.com/s/files/1/0431/4293/8784/files/rupizera.pdf
    • https://cdn.shopify.com/s/files/1/0432/1751/8751/files/bubexizexil.pdf
    • https://cdn.shopify.com/s/files/1/0435/0319/0181/files/tiwolitumilaxemikepi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/62114329075.pdf
    • https://cdn.shopify.com/s/files/1/0429/2893/0979/files/tokiden.pdf
    • https://cdn.shopify.com/s/files/1/0433/5638/9528/files/60561555297.pdf
    • https://cdn.shopify.com/s/files/1/0429/3017/6159/files/9749243773.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_off00007b5c.bin
915002ed26503e0ec1018192de23a2668d98ab3225984b1b3c2f0ad46eea058e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B5C 5004 bytes
font_01_sfnt_off00008c59.bin
099b956d1a5a242171e08d598172524fa249b23f0161a88af7f31e5884b3dcba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C59 10052 bytes

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