Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d37108fd746c359…

MALICIOUS

PDF

49.1 KB Created: 2020-07-21 07:30:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-04
MD5: b2c3bcecae9f6c62aceeec2a8dc7552a SHA-1: 00eea758009eb2d0de98004057dbb3fe0d9d51cb SHA-256: 8d37108fd746c35955d98f7810a423513fe7276e092195a67798661a9c490c5e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, with one specifically identified as a malicious redirector. The document body, though heavily obfuscated, suggests a lure related to translation services, likely intended to trick users into visiting malicious sites. The ML classifier strongly indicates malicious intent, and the presence of a redirector URL points towards a phishing or malware distribution scheme.

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/wb?keyword=google%20translate%20pdf%20from%20spanish%20to%20english In PDF document text
    • http://files.devynayre.com/uploads/1/3/1/4/131408256/sarogavanal_fedili_pevotuwebilo.pdfIn PDF document text
    • http://files.lenapegirlssoccer.com/uploads/1/3/1/4/131453198/tizutofetazijalid.pdfIn PDF document text
    • http://files.mychicagotailor.com/uploads/1/3/1/1/131164572/f146f61dda01b.pdfIn PDF document text
    • http://files.portlandeastsidebaseball.org/uploads/1/3/0/7/130739621/6466552.pdfIn 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/1/0428/3580/4319/files/venega.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9784/1054/files/golim.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/7427/3948/files/52645244781.pdfIn PDF document text
    • https://vigafekiwi.files.wordpress.com/2020/06/12011531497.pdfIn PDF document text
    • https://bupuluz856263956.files.wordpress.com/2020/07/ruferevofugata.pdfIn PDF document text
    • https://sobexabu.files.wordpress.com/2020/07/6041053645.pdfIn PDF document text
    • https://genajow.files.wordpress.com/2020/07/34625109850.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vibemegabixowosepabotabux.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/1958/4166/files/xamewarolisefuze.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1761/7057/files/tizadomizopikoze.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7451/9194/files/21607339680.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/49839171509.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/sazofafusogowo.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_off000078cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x78CF 5276 bytes
SHA-256: 93c1d77868bdbe2aa6da13806bb14afbf58ffbc123e0bb2e72329f2581ae30a6
font_01_sfnt_off00008a95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A95 13860 bytes
SHA-256: 9c92afa17b8a93ac0d758e4bbe63a24871793f25135f296d2bc5033ebd68af28

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