Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc7a0249baf2d196…

MALICIOUS

PDF

44.3 KB Created: 2020-07-23 17:14:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 16598370a126348ff2043944b9a1d7bf SHA-1: 2e21ad97d1728067b1becb3e05a76a857c5e07f7 SHA-256: cc7a0249baf2d196f371f170130e4f664fc440c4f807eedefc05f5ab2279d2a2
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a large number of embedded links, with at least one pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body is heavily obfuscated and appears to be junk data, suggesting the primary purpose is to host these malicious links rather than convey information. The presence of multiple Shopify-hosted PDF links, some marked as benign and others unknown, indicates a link farm strategy.

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.ru/wb?keyword=parable%20of%20talents%20octavia%20butler%20pdf
    • http://files.cakessweetstreats.com/uploads/1/3/1/8/131856904/sorodamafidive.pdf
    • http://files.margierossi.com/uploads/1/3/0/7/130776609/zulibofuwakag.pdf
    • http://files.sharedpen.com/uploads/1/3/0/7/130776502/c5b1d0f.pdf
    • http://files.centralstockcare.com/uploads/1/3/1/6/131606366/dazabiwibeket.pdf
    • https://cdn.shopify.com/s/files/1/0432/6493/4043/files/teroguxetesuratakefokunez.pdf
    • https://cdn.shopify.com/s/files/1/0432/3885/0728/files/96523881595.pdf
    • https://cdn.shopify.com/s/files/1/0434/7396/1110/files/wemevatexixiwamu.pdf
    • https://cdn.shopify.com/s/files/1/0433/7346/1669/files/gukaxi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/81159011373.pdf
    • https://cdn.shopify.com/s/files/1/0439/2707/7032/files/76247600948.pdf
    • https://cdn.shopify.com/s/files/1/0432/5107/3174/files/vovetomef.pdf
    • https://cdn.shopify.com/s/files/1/0428/2194/3463/files/vofez.pdf
    • https://cdn.shopify.com/s/files/1/0433/2814/3510/files/gomosuwidukabezeweji.pdf
    • https://cdn.shopify.com/s/files/1/0431/8996/0861/files/dobaloli.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/
    • https://cdn.shopify.com/s/files/1/0433/7346/1

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006f3e.bin
01219bbd338c483ba6f778b9f07406db1879dc5743d35ebc0c9e8ec6124431fb
pdf-font-stream PDF embedded font (sfnt) at offset 0x6F3E 5232 bytes
font_01_sfnt_off00008116.bin
244ceb38726109ebb6fb4903ce3be7a659f747a3b2347f70fd8cf5647d3d500d
pdf-font-stream PDF embedded font (sfnt) at offset 0x8116 10216 bytes