Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c444997dd90bd56…

MALICIOUS

PDF

38.3 KB Created: 2020-07-25 10:06:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9ef430e33cfd439bf8519804784642b0 SHA-1: 3c967d1cb9e404edbe2428e2e39153487f413026 SHA-256: 5c444997dd90bd56b37291c776b804204464bfbc0cf9a8d32bc2063430ed422e
154 Risk Score

Malware Insights

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

The PDF contains embedded links pointing to known malicious redirector infrastructure, specifically `ttraff.cc`. The document body, though heavily obfuscated, suggests a lure related to 'math lesson answers'. The presence of numerous external PDF links, many hosted on Shopify, indicates a link farm strategy to potentially distribute further malicious content or engage in SEO manipulation for malicious purposes. The ML classifier strongly flagged this PDF as malicious.

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=faceing+math+lesson+2+answers
    • http://files.movitzgroup.com/uploads/1/3/2/6/132696210/ecca383.pdf
    • http://files.findhigherpurpose.com/uploads/1/3/1/0/131070394/1319685.pdf
    • http://files.marriedmarks.com/uploads/1/3/2/8/132816158/wawezanuz-titun-resuta-ponupax.pdf
    • http://files.pediatricdentalalumnisocal.org/uploads/1/3/1/3/131384468/xopumuvi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0440/1030/7749/files/95111259136.pdf
    • https://cdn.shopify.com/s/files/1/0437/2650/4086/files/gamufaxelutabubozedege.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/78394199391.pdf
    • https://cdn.shopify.com/s/files/1/0431/1243/1776/files/vexudabufopowevugamivokik.pdf
    • https://cdn.shopify.com/s/files/1/0438/0455/7472/files/joriken.pdf
    • https://cdn.shopify.com/s/files/1/0432/7152/0409/files/6665706891.pdf
    • https://cdn.shopify.com/s/files/1/0428/2833/3219/files/35026478955.pdf
    • https://cdn.shopify.com/s/files/1/0437/1188/9573/files/gotirobenoxorokefupase.pdf
    • https://cdn.shopify.com/s/files/1/0436/2820/0096/files/37831266351.pdf
    • https://cdn.shopify.com/s/files/1/0436/9743/8875/files/gixuwekusi.pdf
    • https://cdn.shopify.com/s/files/1/0427/6633/6166/files/33784864889.pdf
    • https://cdn.shopify.com/s/files/1/0432/0913/0143/files/82176259756.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_off00005896.bin
10034b79eecd549f50f9dee69e00dd3c07014bbd4e167c2abb6ab65e9c731c9c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5896 5180 bytes
font_01_sfnt_off00006a18.bin
0069dad8c0a92086ff4c0b03e2be184b32001e5dcc2f2d4cae9db08e35e50379		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A18 10048 bytes

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