Malicious PDF — malware analysis report

Static analysis result for SHA-256 7028dcfb13fda89a…

MALICIOUS

PDF

50.0 KB Created: 2020-08-29 03:33:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fd70b9ac46cdb873af1cc0fb8c5c43f0 SHA-1: e2cf502ca427a90dfd76a20e8be99b5f8bad5dbd SHA-256: 7028dcfb13fda89a178782997ffe2c1354315bdc81bd8235737cb49b24ce57be
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many of which point to a redirector service. The ML classifier and heuristics strongly indicate malicious intent, likely to lead users to malicious content or downloads. The presence of embedded URLs and the structure of the document suggest it's part of a link farm or SEO poisoning campaign to distribute malware.

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/wix?keyword=cetusplay+tv+pro+apk
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0440/2174/3781/files/gonagovupejegajorujozi.pdf
    • https://cdn.shopify.com/s/files/1/0430/6586/8437/files/animaciones_en_power_point.pdf
    • https://cdn.shopify.com/s/files/1/0435/2724/1887/files/past_tense_mixed_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0434/4512/5281/files/iron_maiden_wasted_years_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0431/8344/0036/files/jitolasirifez.pdf
    • https://cdn.shopify.com/s/files/1/0435/6446/6335/files/dog_drinking_juice_meme_template.pdf
    • https://cdn.shopify.com/s/files/1/0429/3358/4035/files/govobakud.pdf
    • https://cdn.shopify.com/s/files/1/0427/9618/7815/files/kevuvalibejoniwe.pdf
    • https://cdn.shopify.com/s/files/1/0434/1746/9080/files/jubufo.pdf
    • https://cdn.shopify.com/s/files/1/0433/1687/1326/files/3438050462.pdf
    • https://static.usrfiles.com/ugd/b8c837_658a91e6d12544a3b1221d2717d0980e.pdf
    • https://static.usrfiles.com/ugd/b8c837_c840536c587b45b294d99a09c57bb893.pdf
    • https://static.usrfiles.com/ugd/b8c837_eecd241edafc4bee8eb41560b30756cb.pdf
    • https://static.usrfiles.com/ugd/b8c837_e5c6e364a7c6432a8407218a8b7165ab.pdf
    • https://static.usrfiles.com/ugd/b8c837_c73cfb7d4e44477f809a204966db6af4.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/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000067a9.bin
e2d5503343ff68d67efef55147bcdd7cc27af74a76e1ab678ed2a0f07e4fed8b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67A9 4944 bytes
font_01_sfnt_off00007895.bin
6a93b93c7da8625f32936bf21bfba5a6b345b24d4fa12dfd84ae230d5f75ef28		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7895 14480 bytes
font_02_sfnt_off0000a65a.bin
bb4620ae2308066493f479cb0495314a41e91f5b0bfb2a754d9bad2ef34af03d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA65A 16060 bytes

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