Malicious PDF — malware analysis report

Static analysis result for SHA-256 8df4addf1294e083…

MALICIOUS

PDF

35.0 KB Created: 2020-05-14 17:44:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ecd6daf50e33978a85ee957239f3fe87 SHA-1: fb813de109c51ce5ed11b269d1e2e523b9fe3f0a SHA-256: 8df4addf1294e083f73ce1d02bfe6510caf95bd0a40cf56fd02fa65e522be364
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, a technique commonly used for SEO spam or to redirect users to malicious sites. The ML classifier strongly indicated maliciousness. The document body, though heavily obfuscated, contains references to URLs that are also present in the extracted URL list, reinforcing the link-farming attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 4

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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 http://pottyink.com/uploads/1/3/0/2/130289236/130289236.html#yakuza+3+revelations+answers
    • http://brughlandscaping.com/uploads/1/3/0/8/130874368/490a647a253.pdf
    • http://gonioworks.com/uploads/1/3/1/1/131164110/9467044.pdf
    • http://metalroofingtx.com/uploads/1/3/0/7/130776529/2053129.pdf
    • http://youronlinemarketingplan.com/uploads/1/3/0/6/130639824/53f6fbb5781cb1.pdf
    • http://jacquelinehyra.com/uploads/1/3/0/4/130483123/6235ad2a47.pdf
    • http://gowinger.com/uploads/1/3/0/7/130739405/8612.pdf
    • http://habitfortheplanet.org/uploads/1/3/1/4/131453943/fokutiben_retidaka_titobeto.pdf
    • http://lemke-michelspsychotherapy.com/uploads/1/3/0/3/130323454/5808348.pdf
    • http://hogs.farm/uploads/1/3/0/2/130270873/wamixiwuze.pdf
    • http://amazonadvertising.org/uploads/1/3/0/4/130476859/08bad81ab05.pdf
    • http://vipersales.ca/uploads/1/3/0/6/130639700/lusudixusu_dotilijekuposuw_setujakuzi.pdf
    • http://luisaquezadayoga.com/uploads/1/3/1/4/131437254/xidedebagasa_xiwebaka.pdf
    • http://fresnopersonaltrainingstudio.com/uploads/1/3/0/5/130544781/8795613.pdf
    • http://ambarfunding.net/uploads/1/3/0/2/130271113/liluxafap.pdf
    • http://fightthesilentkiller.com/uploads/1/3/1/3/131379389/duruzawal_tuvadusa_pakis_vavinin.pdf
    • http://techeducation.ca/uploads/1/3/0/7/130740340/soluwisabiwowo.pdf
    • http://patricemichellequarles.com/uploads/1/3/0/8/130874248/xuxobevik.pdf
    • http://peinturedecoration.net/uploads/1/3/0/8/130874540/suxuwunaxupegikijev.pdf
    • http://gtwutu72.org/uploads/1/3/0/8/130814106/xudulowez.pdf
    • http://biomarketeer.com/uploads/1/3/1/4/131438323/3277844.pdf
    • http://claritysagewellness.ca/uploads/1/3/0/5/130588989/dufafazuteb_wetifa_govuvakilugav.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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005f75.bin
edfe00fd92d56035954e45c0e615ce55580136269264717a58344d7d5d4e3b0b
pdf-font-stream PDF embedded font (sfnt) at offset 0x5F75 9544 bytes