Malicious PDF — malware analysis report

Static analysis result for SHA-256 97b784a6b150db68…

MALICIOUS

PDF

34.4 KB Created: 2020-08-14 21:02:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e58afac142cd823f00bd9264603a761d SHA-1: 74583479f91ac2d9a9559b6ceeb71943cddb8efa SHA-256: 97b784a6b150db687c1b699d0a22eee9151371ff295d2ee51f832dda31f418ca
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. The document body, though heavily obfuscated, contains text related to 'grade 1 worksheets' and the malicious URL, suggesting a lure. The PDF also exhibits characteristics of a link farm, with numerous embedded URLs, many pointing to Shopify domains, likely for SEO manipulation to increase visibility. 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.com/pify?keyword=grade+1+worksheets+deped
    • http://files.gracejiang.info/uploads/1/3/1/8/131856627/4945528.pdf
    • http://files.mizpah36.org/uploads/1/3/1/3/131379045/6624586.pdf
    • http://gozinud.mrmaglocci.com/uploads/1/3/0/8/130873790/kuwetumurog_roguwa_jemuwaji_pujimor.pdf
    • https://cdn.shopify.com/s/files/1/0432/5320/3104/files/super_bluetooth_hacker_1._08.pdf
    • https://cdn.shopify.com/s/files/1/0437/1405/2247/files/select_random_charachters_from_latin_in_nodejs.pdf
    • https://cdn.shopify.com/s/files/1/0434/0963/7533/files/71956111034.pdf
    • https://cdn.shopify.com/s/files/1/0432/7240/5157/files/maxomisop.pdf
    • https://cdn.shopify.com/s/files/1/0437/5393/0901/files/zunenegefe.pdf
    • https://cdn.shopify.com/s/files/1/0431/7098/8196/files/tosojorosudo.pdf
    • https://cdn.shopify.com/s/files/1/0440/4484/5206/files/english_speaking_course_in_marathi.pdf
    • https://cdn.shopify.com/s/files/1/0430/9496/6429/files/bapozukevob.pdf
    • https://cdn.shopify.com/s/files/1/0431/3153/5524/files/93594949255.pdf
    • https://cdn.shopify.com/s/files/1/0433/5131/0488/files/tenafeguwo.pdf
    • https://cdn.shopify.com/s/files/1/0430/1117/8649/files/budget_2020_speech.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/37394074323.pdf
    • https://cdn.shopify.com/s/files/1/0429/7929/5385/files/58001974208.pdf
    • https://cdn.shopify.com/s/files/1/0437/9177/7949/files/becker_cpa_books_2020.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_off000048e6.bin
66b427af2ff9e1d6075802812c404335947700cbc0700af6399ac0aba0b92f87		 pdf-font-stream PDF embedded font (sfnt) at offset 0x48E6 5252 bytes
font_01_sfnt_off00005adf.bin
ec08fc757988d553bfb72dae1902123de7a17a06866843f5fd96eecb84b449f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5ADF 10048 bytes

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