Malicious PDF — malware analysis report

Static analysis result for SHA-256 96bc5884b68b1340…

MALICIOUS

PDF

47.9 KB Created: 2020-07-24 17:55:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ce28d56bf352bcf9abab44db0fc29d44 SHA-1: 2460a8db202491f5ed3c63cfaae3fb26d46c8574 SHA-256: 96bc5884b68b13401279a8d0c6c23566ac8a994de287ed39b8a898acfbbf3803
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, designed to redirect users to malicious infrastructure. One such redirector URL is explicitly identified as malicious. The document body, though heavily obfuscated, appears to contain keywords related to a product manual, suggesting a lure to trick users into clicking the malicious 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/wb?keyword=resmed%20sleep%20apnea%20machine%20manual
    • http://files.robertobertero.com/uploads/1/3/1/8/131871786/04a540ed9fe3c67.pdf
    • http://files.rrrtag.com/uploads/1/3/0/7/130740128/gazizosawamoke_mekapinu_kikabuxiliko_mumofo.pdf
    • http://files.workinnvision.com/uploads/1/3/1/3/131384018/zudemesenodevakani.pdf
    • https://cdn.shopify.com/s/files/1/0431/4244/7265/files/40253126107.pdf
    • https://cdn.shopify.com/s/files/1/0433/5868/3294/files/37152348059.pdf
    • https://cdn.shopify.com/s/files/1/0431/5951/9387/files/xobenudawurakikilo.pdf
    • https://cdn.shopify.com/s/files/1/0427/6387/8566/files/nazezirivuloro.pdf
    • https://cdn.shopify.com/s/files/1/0430/7173/3917/files/kigir.pdf
    • https://cdn.shopify.com/s/files/1/0431/6522/1028/files/72367989549.pdf
    • https://cdn.shopify.com/s/files/1/0428/7594/5113/files/sazebew.pdf
    • https://cdn.shopify.com/s/files/1/0432/8869/0841/files/juvivekuvorarojuwam.pdf
    • https://cdn.shopify.com/s/files/1/0437/4803/2666/files/lexam.pdf
    • https://cdn.shopify.com/s/files/1/0433/3866/2053/files/13077278228.pdf
    • https://cdn.shopify.com/s/files/1/0428/5733/2895/files/merowegivinomarelugef.pdf
    • https://cdn.shopify.com/s/files/1/0431/4293/8784/files/vipafasezubatiwat.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_off00007dc4.bin
6e5b86658622aad302e8c65c835c971f062d9a77c746d674e94b94a5fdda5b8a
pdf-font-stream PDF embedded font (sfnt) at offset 0x7DC4 4916 bytes
font_01_sfnt_off00008e3e.bin
fb7c18fea269b7a2ad115097c9f668cd0968bb30d29a03c27118433b46f2c503
pdf-font-stream PDF embedded font (sfnt) at offset 0x8E3E 10504 bytes