Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5b1762b9b7c5007…

MALICIOUS

PDF

57.7 KB Created: 2020-08-02 10:27:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2a49eb6db467b39d4d48e45bedacdcb9 SHA-1: 1b629b95fd75f75a4cbd805a8bdd961cfd43a1a0 SHA-256: e5b1762b9b7c500710313473ebb784838f72bea41a41dfcacc4674e3a16d2c19
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files hosted on Shopify. One of the primary links, 'https://ttraff.ru/pify?keyword=tv+schedule+des+moines+iowa', is flagged as a malicious redirector. The ML classifier strongly indicates maliciousness, and the overall structure suggests a link farm or SEO poisoning tactic to drive traffic to malicious sites.

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.ru/pify?keyword=tv+schedule+des+moines+iowa
    • http://files.confessionsofanunderachiever.com/uploads/1/3/1/4/131437333/6cb47767ec77ac.pdf
    • http://files.teatimeboba.com/uploads/1/3/1/3/131380754/wasuge-fonavaxegatogo.pdf
    • http://files.storiesetalia.com/uploads/1/3/0/8/130873791/vufanafenigozotorel.pdf
    • https://cdn.shopify.com/s/files/1/0435/9726/7112/files/dofewebuwijalifoxupotaxof.pdf
    • https://cdn.shopify.com/s/files/1/0427/4647/8759/files/64100485048.pdf
    • https://cdn.shopify.com/s/files/1/0433/6232/0536/files/81549821400.pdf
    • https://cdn.shopify.com/s/files/1/0434/7835/2034/files/begimupafu.pdf
    • https://cdn.shopify.com/s/files/1/0433/7260/9686/files/pepaxibilitiwopufivom.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/45366335679.pdf
    • https://cdn.shopify.com/s/files/1/0431/8022/8759/files/jagekiselitilotimibotifa.pdf
    • https://cdn.shopify.com/s/files/1/0434/0632/7959/files/85850221369.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kubogofire.pdf
    • https://cdn.shopify.com/s/files/1/0431/2258/9853/files/webugolotudorimoxu.pdf
    • https://cdn.shopify.com/s/files/1/0429/7339/7145/files/87534579444.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_off00008629.bin
d162519c0813f7a4d862bf43d559917d84f2c668d746f658de6476f4a17bf617		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8629 4984 bytes
font_01_sfnt_off000096f0.bin
4910d0177da9f60ecc92c13a34fae8c5c38ffafb9e4e22a3c3fd987548b79157		 pdf-font-stream PDF embedded font (sfnt) at offset 0x96F0 6148 bytes
font_02_sfnt_off0000a6d1.bin
c9e5cde120f01312db719386406ac8c45ebfee253c2e05cfef06681f88e98962		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA6D1 10872 bytes
font_03_sfnt_off0000cbb7.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCBB7 4324 bytes

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