Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc782993eae29284…

MALICIOUS

PDF

38.6 KB Created: 2020-08-02 18:46:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e6810bb4baec2e4984a5ac52fa6e708c SHA-1: d849a31664aa9fce97b70e1494dab4e4161779e3 SHA-256: cc782993eae29284da452f876d24f81070843fba34ece73ca7cc34a061fcb558
154 Risk Score

Malware Insights

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

The PDF contains a link farm with 17 external links, many hosted on Shopify, and a primary malicious redirector URL. The document body explicitly mentions 'how to extend adobe trial', aligning with the malicious redirector's URL. The ML classifier strongly flagged this PDF as malicious. The primary attack vector appears to be a lure to a malicious redirector disguised as a helpful document.

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/pify?keyword=how+to+extend+adobe+trial
    • http://files.sparklove.info/uploads/1/3/0/7/130775867/8175067.pdf
    • http://files.cedgephotography.com/uploads/1/3/1/4/131453252/3fb31a923c8e.pdf
    • http://files.nehb.net/uploads/1/3/0/7/130776073/d543d1333c9.pdf
    • http://files.lifebydesignpa.com/uploads/1/3/1/8/131857114/mejekup-bamonesum-bavusa.pdf
    • https://cdn.shopify.com/s/files/1/0432/3645/8654/files/numutape.pdf
    • https://cdn.shopify.com/s/files/1/0435/3549/9418/files/xisovop.pdf
    • https://cdn.shopify.com/s/files/1/0432/9812/8036/files/manaxuganopenu.pdf
    • https://cdn.shopify.com/s/files/1/0437/9354/7424/files/convert_m4b_to_mp3_free.pdf
    • https://cdn.shopify.com/s/files/1/0429/6579/4965/files/666513643.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/84511803825.pdf
    • https://cdn.shopify.com/s/files/1/0438/4745/0784/files/38161393980.pdf
    • https://cdn.shopify.com/s/files/1/0433/8922/3066/files/12292203117.pdf
    • https://cdn.shopify.com/s/files/1/0432/1860/0103/files/39815395277.pdf
    • https://cdn.shopify.com/s/files/1/0433/2643/9582/files/jekukesuduwu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/38659434623.pdf
    • https://cdn.shopify.com/s/files/1/0429/2814/4543/files/10752567420.pdf
    • https://cdn.shopify.com/s/files/1/0430/9798/1089/files/76960081777.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_off000059f9.bin
03f874e5e7a758c37a5007ac61cbbd06a1b6e87df760fd189a3b7502c54226cb
pdf-font-stream PDF embedded font (sfnt) at offset 0x59F9 4900 bytes
font_01_sfnt_off00006ac0.bin
3597b93c4284bf2320745d915a76fba3c7c24f360bc05058e253c0511e34f039
pdf-font-stream PDF embedded font (sfnt) at offset 0x6AC0 10224 bytes