Malicious PDF — malware analysis report

Static analysis result for SHA-256 85bf75d803948956…

MALICIOUS

PDF

45.6 KB Created: 2020-08-24 01:25:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 602c28a9abb3e95577cf96d0e857944c SHA-1: 4d49a4210017ead634f837217a918ef10458ffa5 SHA-256: 85bf75d8039489569d1f2f7061c52f334345569b565659061b88613ee53c7b7e
154 Risk Score

Malware Insights

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

The PDF contains a link farm and a redirector URL, indicating an attempt to direct users to malicious sites. The embedded content, though obfuscated, contains the redirector URL and appears to be part of a lure. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a phishing or redirection attack.

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=bonjour+apple+inc+windows+10
    • http://files.getbackpainfree.com/uploads/1/3/0/8/130813769/8483869.pdf
    • http://files.travelwithkalsi.com/uploads/1/3/1/4/131410007/1054703.pdf
    • http://files.bendtrendhomes.com/uploads/1/3/0/7/130775677/tuzupuruwu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/0046/2501/files/toxefutemifunujatuzumawut.pdf
    • https://cdn.shopify.com/s/files/1/0432/9242/6405/files/85354145364.pdf
    • https://cdn.shopify.com/s/files/1/0430/1701/1353/files/child_care_business_plan_sample_free.pdf
    • https://cdn.shopify.com/s/files/1/0431/1157/9809/files/bright_futures_12_month.pdf
    • https://cdn.shopify.com/s/files/1/0431/1734/6965/files/52712157994.pdf
    • https://cdn.shopify.com/s/files/1/0432/1450/4093/files/71681825702.pdf
    • https://cdn.shopify.com/s/files/1/0438/2726/5698/files/54583658992.pdf
    • https://cdn.shopify.com/s/files/1/0434/6413/0725/files/84800722011.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/32829552166.pdf
    • https://cdn.shopify.com/s/files/1/0431/4847/6570/files/pafabegadupulufavukebarop.pdf
    • https://cdn.shopify.com/s/files/1/0438/5266/0901/files/57766296082.pdf
    • https://cdn.shopify.com/s/files/1/0435/5883/0229/files/siponuwuvosuxexe.pdf
    • https://cdn.shopify.com/s/files/1/0435/2658/6527/files/patriarchy_definition_sociology.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_off0000733f.bin
ad4ebbf822909aa859d37c0c1014fbbf3d9263fce27edbfdf1d110660f1854c1
pdf-font-stream PDF embedded font (sfnt) at offset 0x733F 5476 bytes
font_01_sfnt_off00008601.bin
830c66e31618917f3443bc7a0711fda9c0c04779d62be668b6a57e620349bd1a
pdf-font-stream PDF embedded font (sfnt) at offset 0x8601 10308 bytes