Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a23fbc6c9d88960…

MALICIOUS

PDF

44.3 KB Created: 2020-09-02 16:07:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 5edd23554b6ab4a3434a7e051521bb67 SHA-1: 9fbc8c300dec97045d45e9be5a9b0f743acdf76a SHA-256: 5a23fbc6c9d88960c1befa7d5ca915de7247c96f05753d25bdcf341cf95b79b9
154 Risk Score

Malware Insights

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

The PDF contains a disguised link to a malicious redirector, masquerading as a search result for 'avatar last airbender 2 full movie'. This is further supported by heuristics indicating a malicious redirector link and a link farm, suggesting an attempt to drive traffic to malicious sites. The ML classifier also 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.link/pify?keyword=avatar+last+airbender+2+full+movie In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/1407/9143/files/arabic_language_history.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/9975/8497/files/tarot_card_meanings_major_arcana.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7307/7415/files/10742158414.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5661/0979/files/81012476156.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/5004/1495/files/behaviour_management_in_pediatric_dentistry.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/mozinetesabelenigifil.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/2834/9085/files/4342654662.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3311/6315/files/sinosurowadupusalinudafi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0641/8331/files/dnya_siyasi_harita.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/c3f59f_462fb255043c453296412f32d46cf582.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/ce77c6_98725d93d4a2480da20325992771428e.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/a2e20a_f1bf565bed95420dafb8ae9806fddcb0.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/8c2aca_b285d806284c4ef28f54b889eedec1ae.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/5fd5c1_a33f13d813834062a0860cb52c4ee68a.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9218/1145/files/buzab.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9067/3813/files/peraxufe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/8669/9925/files/chamak_chamak_cham_old_song.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/4081/5774/files/chamsys_mq40_manual.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006eab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6EAB 5376 bytes
SHA-256: 61b45c6dfa21f83c59c54352bdaeaf368fdb0a1ed76a7d3ec3a063514028a7cb
font_01_sfnt_off000080e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x80E2 10344 bytes
SHA-256: bd41bd48f4dfbe62f6b7b6b2323669f317b1fcaa3bddf3deda2394c09462d34e

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