Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed948df81e8acc67…

MALICIOUS

PDF

46.1 KB Created: 2020-08-20 08:49:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1e69dbbeeb44b92726019b3a15d86726 SHA-1: 1800ef2de924ac37baac053b6804a783f194f68d SHA-256: ed948df81e8acc6739374827494b09bd9f5b5b28a038f17ce8500d7886bbb30c
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.ru, which is used to obscure the final destination. The document body, though heavily obfuscated, contains the text 'Bullet points resume format' and the malicious URL, suggesting a lure for phishing or a scam. The presence of numerous links to external PDFs, many hosted on Shopify, indicates a link farm strategy. The ML classifier strongly flagged this PDF as malicious.

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=bullet+points+resume+format
    • http://files.remembrancestars.com/uploads/1/3/1/3/131384589/5470188.pdf
    • http://wakatisu.maryloutrinkwon.com/uploads/1/3/1/1/131164250/1393934.pdf
    • http://files.liftinggearhampshire.com/uploads/1/3/1/4/131408172/0a186931f94820.pdf
    • https://cdn.shopify.com/s/files/1/0429/8362/0767/files/17982094781.pdf
    • https://cdn.shopify.com/s/files/1/0431/5476/8021/files/cascada_de_coagulacion_sanguinea.pdf
    • https://cdn.shopify.com/s/files/1/0429/3555/0111/files/nixejarepevavano.pdf
    • https://cdn.shopify.com/s/files/1/0434/2956/0486/files/kojoragikelowupara.pdf
    • https://cdn.shopify.com/s/files/1/0433/9105/8070/files/defunudodezizukusiwo.pdf
    • https://cdn.shopify.com/s/files/1/0431/9775/9643/files/89884255213.pdf
    • https://cdn.shopify.com/s/files/1/0435/0800/7072/files/dojub.pdf
    • https://cdn.shopify.com/s/files/1/0429/8201/5135/files/76315722290.pdf
    • https://cdn.shopify.com/s/files/1/0437/1687/0293/files/wutipafuposubirozizukedix.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/mobisibat.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000672b.bin
8fa656a109c3dd98f826841496442d1157c0e6ec2869b9a7c4ec1d84e204fb04
pdf-font-stream PDF embedded font (sfnt) at offset 0x672B 4980 bytes
font_01_sfnt_off000077f1.bin
1a30f5bbc8b6ef208088cb73999f291ba8c82a741399482e3badb878e71248ab
pdf-font-stream PDF embedded font (sfnt) at offset 0x77F1 10876 bytes
font_02_sfnt_off00009d19.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34
pdf-font-stream PDF embedded font (sfnt) at offset 0x9D19 4324 bytes