Malicious PDF — malware analysis report

Static analysis result for SHA-256 aeb548adc61cedb1…

MALICIOUS

PDF

42.5 KB Created: 2020-08-08 00:45:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 191c14f1c800d6e79b0933769b789aa1 SHA-1: c365dec1d60d6c724c93963613f542a8d2788f6d SHA-256: aeb548adc61cedb1549e171b7b43aa59940d67c7a38a20b2d6de6e8277066f89
152 Risk Score

Malware Insights

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

The PDF contains a link farm designed to redirect users to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though partially corrupted, contains a job-related search term which is likely a lure. The ML classifier strongly flagged this PDF as malicious. The primary IOC is the redirector URL.

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=ap+grama+sachivalayam+jobs+syllabus+2020+pdf
    • http://fereg.heathernlettow.com/uploads/1/3/2/6/132681352/moviguwolubupujeked.pdf
    • http://files.roamingtaurus.com/uploads/1/3/2/6/132695679/semojawa.pdf
    • http://files.divine-pet-services.com/uploads/1/3/0/7/130775846/roketonosukezasufit.pdf
    • http://mefogov.thejourneyinternational.org/uploads/1/3/1/6/131637254/dadatareru_lagetodasa.pdf
    • http://files.seyabookfest.com/uploads/1/3/2/7/132740764/suxasape-kirufasozekozi-mesobabibix-kafadotidijop.pdf
    • https://cdn.shopify.com/s/files/1/0436/7984/2457/files/10750229567.pdf
    • https://cdn.shopify.com/s/files/1/0429/4931/2665/files/melafe.pdf
    • https://cdn.shopify.com/s/files/1/0430/9562/1786/files/mathematics_for_seismic_data_processing_and_interpretation.pdf
    • https://cdn.shopify.com/s/files/1/0432/7404/3556/files/minecraft_wrath_enchantment.pdf
    • https://cdn.shopify.com/s/files/1/0431/0145/4500/files/vakifadividigasubita.pdf
    • https://cdn.shopify.com/s/files/1/0428/2816/9382/files/coconut_scale_insect.pdf
    • https://cdn.shopify.com/s/files/1/0431/1236/6229/files/logic_gates_and_boolean_algebra_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0435/8461/8653/files/tipovewewudomutefo.pdf
    • https://cdn.shopify.com/s/files/1/0432/8167/8494/files/puxejone.pdf
    • https://cdn.shopify.com/s/files/1/0434/7002/8966/files/45951286312.pdf
    • https://cdn.shopify.com/s/files/1/0430/2408/9242/files/17420154920.pdf
    • https://cdn.shopify.com/s/files/1/0432/7574/7491/files/94209855077.pdf
    • https://cdn.shopify.com/s/files/1/0433/4875/4600/files/maplestory_spearman_guide.pdf
    • https://cdn.shopify.com/s/files/1/0433/7978/5891/files/1752190249.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_off000065e2.bin
f664b1fe598cd8bcd1d1076fe862575de5827c0be30bc89198935e7f710ca0cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65E2 6208 bytes
font_01_sfnt_off00007af2.bin
a73fc23ecdd53347ba65aa0a01f9328ae7587bbc5ca946ec2d65906b798e7234		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7AF2 9852 bytes

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