Malicious PDF — malware analysis report

Static analysis result for SHA-256 31f9dbe2be29ef88…

MALICIOUS

PDF

67.6 KB Created: 2020-08-07 06:33:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fc1559db8d7d28ff3131704cb392e5bd SHA-1: 87463a728b397d16969641db32024f2d505ee0e1 SHA-256: 31f9dbe2be29ef88a27cebc4daec97ec52e556997c93ec4c388efaafb163dc86
152 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier with high confidence. Static analysis revealed it contains a link farm with numerous external PDF links, including a critical redirector link to 'ttraff.cc'. This suggests the document's primary purpose is to lure users to malicious sites, likely for phishing or to download further malware. The document body itself contains garbled text and a URL that mirrors the redirector link.

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=declarative+interrogative+imperative+exclamatory+sentences+pdf
    • http://files.amylouise-psychotherapy.co.uk/uploads/1/3/0/7/130739039/6548844.pdf
    • http://goxuseba.floatwyo.com/uploads/1/3/0/7/130775195/jevas_jodef.pdf
    • http://files.handmadeofvillage.com/uploads/1/3/0/7/130739991/9c00f47b3.pdf
    • http://files.joshualively.com/uploads/1/3/1/4/131437457/5496950.pdf
    • http://files.ponderosaguild.org/uploads/1/3/0/9/130969494/puzafukakofej-jusapa-wafaviwavutewa-jelukasaji.pdf
    • https://cdn.shopify.com/s/files/1/0430/6799/8359/files/wasogatakonuvexekusijifo.pdf
    • https://cdn.shopify.com/s/files/1/0429/9964/4314/files/mba_hr_interview_questions_and_answers_for_freshers.pdf
    • https://cdn.shopify.com/s/files/1/0428/4180/0860/files/nosiwunamiveju.pdf
    • https://cdn.shopify.com/s/files/1/0431/2023/0564/files/61210517329.pdf
    • https://cdn.shopify.com/s/files/1/0434/5951/0425/files/97887798424.pdf
    • https://cdn.shopify.com/s/files/1/0430/7389/6602/files/reverse_a_linked_list.pdf
    • https://cdn.shopify.com/s/files/1/0434/0006/9285/files/fukafodedosesugipurasaw.pdf
    • https://cdn.shopify.com/s/files/1/0430/6819/4978/files/7784729090.pdf
    • https://cdn.shopify.com/s/files/1/0434/4145/5254/files/88089902935.pdf
    • https://cdn.shopify.com/s/files/1/0438/7074/8827/files/josegukudajiwusobaza.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b395.bin
a17885b4fd577e0298a64705d5055d2ac7c2363fd7008e9cf236b3df412a17d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB395 2828 bytes
font_01_sfnt_off0000bd8f.bin
1fc7ed2735085131f6812a068797933e60ccf37587a07af17118344ede28a2a4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBD8F 5492 bytes
font_02_sfnt_off0000d033.bin
bf1b46773513471780d42341c3b8e2d2464e8373814978919bfd22df09ed50ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD033 9812 bytes
font_03_sfnt_off0000f1db.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1DB 4324 bytes

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