Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab5b4b058700d035…

MALICIOUS

PDF

46.0 KB Created: 2020-08-17 14:55:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d03d130cd2655419439da7d729010426 SHA-1: 8b661f2c3d302874386e9dc2821f292baef38ad0 SHA-256: ab5b4b058700d035f70b9d03445e77bc25ec63e07dfa1f0471b3ffd1b990bdae
152 Risk Score

Malware Insights

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

The PDF contains a link to `https://ttraff.cc/pify?keyword=aceable+drivers+ed+answers+chapter+1`, which is flagged as a malicious redirector. The document also includes a mass of external PDF links, many hosted on `cdn.shopify.com`, suggesting a link farm designed to improve search engine ranking for the malicious content. The ML classifier strongly indicated maliciousness.

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.cc/pify?keyword=aceable+drivers+ed+answers+chapter+1
    • http://files.pacescholarshipacademy.com/uploads/1/3/1/0/131071082/xikujuboretovamulex.pdf
    • http://files.conteanalytics.com/uploads/1/3/1/3/131382395/7d07e14bc6dcf9.pdf
    • http://wojugun.thomasstreetpharmacy.com/uploads/1/3/1/0/131070487/suzukopeporiwi_bukum.pdf
    • https://cdn.shopify.com/s/files/1/0430/8421/8521/files/43108095306.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/80787326618.pdf
    • https://cdn.shopify.com/s/files/1/0432/4691/1643/files/no_one_is_righteous_no_not_one.pdf
    • https://cdn.shopify.com/s/files/1/0444/5110/2887/files/aeration_tank_volume_calculation.pdf
    • https://cdn.shopify.com/s/files/1/0430/5525/1605/files/clover_japanese_movie.pdf
    • https://cdn.shopify.com/s/files/1/0433/4934/4421/files/vutuzisajukudi.pdf
    • https://cdn.shopify.com/s/files/1/0447/5496/0535/files/ap_calculus_10e.pdf
    • https://cdn.shopify.com/s/files/1/0434/2821/6983/files/mexisovagaxovupojagateg.pdf
    • https://cdn.shopify.com/s/files/1/0439/9936/3222/files/upsc_syllabus_2016.pdf
    • https://cdn.shopify.com/s/files/1/0430/7664/9124/files/content_editible_copy_and_paste.pdf
    • https://cdn.shopify.com/s/files/1/0429/8955/1770/files/diwute.pdf
    • https://cdn.shopify.com/s/files/1/0430/4856/6941/files/16964534625.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000066d1.bin
4e8c51215a225a1de4afcb7ecd3247174b0153288d4be64c78be2436f38b718c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66D1 5172 bytes
font_01_sfnt_off0000785b.bin
81f9d433dae5e3d99c996983961eeb0a9b90e22da77763be366f6eddc1394a86		 pdf-font-stream PDF embedded font (sfnt) at offset 0x785B 10760 bytes
font_02_sfnt_off00009cea.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9CEA 4324 bytes

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