Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2c56130ebf1f679…

MALICIOUS

PDF

39.7 KB Created: 2020-08-10 17:26:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d52545e521d1f3b8297f64f209dc7081 SHA-1: fe09ff4e30b21136cff14a2218b24b8935d03d52 SHA-256: a2c56130ebf1f679823a29efa3de94ee5fa39d6f7786610de71bbb7056df29cf
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a significant number of embedded links, with the primary redirector URL being https://ttraff.com/pify?keyword=diagnostico+anemia+de+celulas+falciformes+pdf. This indicates a likely attempt to lure users to malicious sites. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted from this sample.

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=diagnostico+anemia+de+celulas+falciformes+pdf
    • http://files.jenniferepatterson.org/uploads/1/3/2/6/132696233/mufoj.pdf
    • http://files.tikvattzion.com/uploads/1/3/1/1/131164185/kidotafom_tatinetizokegiv_walogisanox.pdf
    • http://tebafunol.cookiemethat.com/uploads/1/3/1/8/131871390/fanejuradok-xefese.pdf
    • http://files.interfaithutica.org/uploads/1/3/0/7/130775393/fb660.pdf
    • http://files.pawneelanes.com/uploads/1/3/2/6/132682239/5690302.pdf
    • https://cdn.shopify.com/s/files/1/0439/2786/3464/files/how_to_compact_a_file.pdf
    • https://cdn.shopify.com/s/files/1/0433/3161/6923/files/low_cholesterol_diet_meal_plan.pdf
    • https://cdn.shopify.com/s/files/1/0434/7078/2624/files/17625398127.pdf
    • https://cdn.shopify.com/s/files/1/0432/5693/8646/files/fikevadobukagekijege.pdf
    • https://cdn.shopify.com/s/files/1/0432/2266/3325/files/foderubukibunax.pdf
    • https://cdn.shopify.com/s/files/1/0433/7870/4545/files/daily_use_english_sentences_with_urdu_translation.pdf
    • https://cdn.shopify.com/s/files/1/0433/4449/4750/files/37841735873.pdf
    • https://cdn.shopify.com/s/files/1/0435/2779/8944/files/ledasikefuwe.pdf
    • https://cdn.shopify.com/s/files/1/0437/4115/1386/files/estudio_de_apologetica_cristiana.pdf
    • https://cdn.shopify.com/s/files/1/0439/4627/9080/files/appointed_person_lifting_operations.pdf
    • https://cdn.shopify.com/s/files/1/0428/5467/8687/files/how_to_use_apktool.pdf
    • https://cdn.shopify.com/s/files/1/0438/3604/7525/files/29967825613.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/24375498268.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_off00005ba8.bin
7a7c7a929b0c6cf5b3e361793f7bef0251fa8c267b23aa4ca70897e3bf9e1f56		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5BA8 5476 bytes
font_01_sfnt_off00006e31.bin
73d5e80f73ac970860c80923f11eaeb63a1ec83223030595c16225733d085a63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E31 11008 bytes

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