Malicious PDF — malware analysis report

Static analysis result for SHA-256 15b61fda4fcbbae1…

MALICIOUS

PDF

34.7 KB Created: 2020-08-27 12:47:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1411e26a90572f7e41585ef4eb139253 SHA-1: 576f10a610340690962ffa918494ed38cf23211f SHA-256: 15b61fda4fcbbae1147b1d781b23d40066bab2c8c588014817c01cb64b45d968
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though partially corrupted, contains text that appears to be a lure for a user guide, and the URL itself contains 'aleks user guide'. The presence of a link farm suggests an attempt to distribute malicious content widely. While no scripts were directly extracted, the PDF structure and embedded links are indicative 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.club/pify?keyword=aleks+user+guide
    • http://xabes.highheartcrystalhealing.com/uploads/1/3/2/6/132695535/pukitowipaketu.pdf
    • http://files.laurelwoodtroy.com/uploads/1/3/0/9/130969357/xinajutef-zerexakudugagup-fuwavemep.pdf
    • http://files.travellingpen.com/uploads/1/3/1/0/131070689/7766853.pdf
    • http://files.mistymaids.net/uploads/1/3/1/6/131606291/vadarikof-neviz-lipisusap-dasefulamakeso.pdf
    • http://popepuxef.adornments.ca/uploads/1/3/0/7/130740465/gonexeka.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/2906/1014/files/wilumojuzidopote.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/kirojaj.pdf
    • https://cdn.shopify.com/s/files/1/0430/4715/7914/files/6462838782.pdf
    • https://cdn.shopify.com/s/files/1/0434/7176/5656/files/chefman_air_fryer_user_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/9464/6689/files/les_miserables_sheet_music_free.pdf
    • https://cdn.shopify.com/s/files/1/0433/8096/5534/files/xupodovarujekubitunopaxak.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kekesapenogetiru.pdf
    • https://cdn.shopify.com/s/files/1/0427/4195/6775/files/fenopemakirifabinej.pdf
    • https://cdn.shopify.com/s/files/1/0439/4365/7627/files/wefebagujovuget.pdf
    • https://cdn.shopify.com/s/files/1/0427/8488/2844/files/58436501724.pdf
    • https://cdn.shopify.com/s/files/1/0431/7046/3912/files/stardew_valley_spring_crops_bundle.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_off00004b7f.bin
2c77cc31dbc0013fe5839349eb6a637af6104f6ccde3be894ef786d7aad1fe29		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4B7F 4836 bytes
font_01_sfnt_off00005bfc.bin
ef5405ff75371ab4e11d5646360ff764d4cb88ab03a4595382fd564075676607		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5BFC 10108 bytes

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