Malicious PDF — malware analysis report

Static analysis result for SHA-256 74a0261c3c230c74…

MALICIOUS

PDF

44.1 KB Created: 2020-08-19 18:20:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 28c70bdf58f01956836cac3d3c1a03cc SHA-1: 7ea3f599f828755aded4c0113ec844834f991538 SHA-256: 74a0261c3c230c74e8a095ba1b14f200fea0ac0777186dacdbcc03f5bea3293b
154 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with a critical heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK, pointing to `https://ttraff.cc/pify?keyword=atmega328+programming+manual`. This indicates an attempt to redirect users to malicious infrastructure, likely for phishing or malware distribution. The PDF also exhibits characteristics of a link farm, with many links to Shopify-hosted PDFs, suggesting an SEO-based lure. 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.cc/pify?keyword=atmega328+programming+manual
    • http://files.johnsonhousebullies.com/uploads/1/3/1/4/131438464/zuragitetikumitataku.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0427/8052/4710/files/96734682513.pdf
    • https://cdn.shopify.com/s/files/1/0430/3116/7137/files/siboga.pdf
    • https://cdn.shopify.com/s/files/1/0435/3972/6487/files/assam_history_in_assamese_language.pdf
    • https://cdn.shopify.com/s/files/1/0431/7013/6218/files/jimuxuxuruworoveli.pdf
    • https://cdn.shopify.com/s/files/1/0435/8779/7160/files/76272807497.pdf
    • https://cdn.shopify.com/s/files/1/0436/5264/5017/files/24_hours_a_day_hazelden.pdf
    • https://cdn.shopify.com/s/files/1/0427/8976/5279/files/53691302110.pdf
    • https://cdn.shopify.com/s/files/1/0430/9165/6855/files/who_sings_somebody_s_watching_me.pdf
    • https://cdn.shopify.com/s/files/1/0445/5848/3620/files/caderno_de_anotaes_congresso_2018.pdf
    • https://cdn.shopify.com/s/files/1/0430/6668/7639/files/tifowuvevidar.pdf
    • https://cdn.shopify.com/s/files/1/0430/6393/5129/files/celebrity_endorsement_case_study.pdf
    • https://cdn.shopify.com/s/files/1/0434/1828/8277/files/37545159782.pdf
    • https://cdn.shopify.com/s/files/1/0433/8070/3382/files/xilowuxaxevul.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_off000069b6.bin
15f7a308107dd3b4148ccd861b2c43b39b04907f10996bc68c439f1baead421d
pdf-font-stream PDF embedded font (sfnt) at offset 0x69B6 5440 bytes
font_01_sfnt_off00007c1e.bin
2e34c4052caf9aa83ac11ebfc2ab94facb10b4ccf33bbe9ad510b5d442eb3d33
pdf-font-stream PDF embedded font (sfnt) at offset 0x7C1E 12068 bytes