Malicious PDF — malware analysis report

Static analysis result for SHA-256 92bc3d5a3a999dae…

MALICIOUS

PDF

44.7 KB Created: 2020-08-04 06:17:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d57d92f5b021e4f165a5cf4a5dd1c5a9 SHA-1: e40fb5fe020eec07f11306fb42b96c5cc16c5409 SHA-256: 92bc3d5a3a999dae2eac386f6014436295703338c96e2ef65f3b7698927b7642
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, specifically 'https://ttraff.cc/pify?keyword=meaning+of+social+economic+development+pdf'. This indicates the document's primary purpose is to redirect users to potentially harmful websites. Additionally, the PDF exhibits characteristics of a link farm, with numerous embedded URLs pointing to external resources, further supporting the malicious intent of driving traffic to external sites. The ML classifier also strongly flagged this PDF as malicious.

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=meaning+of+social+economic+development+pdf
    • http://files.sportsecurities.com/uploads/1/3/1/4/131453818/1033644.pdf
    • http://files.chazakbordercollies.com/uploads/1/3/1/8/131872273/4195131.pdf
    • http://files.makeyourownlipstick.com/uploads/1/3/1/4/131483201/kixebabokogolumuzep.pdf
    • http://files.myersmarinedivision.com/uploads/1/3/2/7/132712015/manipurototan-nidoxasenil-duneworexumopix-wowip.pdf
    • https://cdn.shopify.com/s/files/1/0432/6051/0376/files/sarejinadili.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/83300066175.pdf
    • https://cdn.shopify.com/s/files/1/0432/0677/0849/files/vezifu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/taselalodomojobuda.pdf
    • https://cdn.shopify.com/s/files/1/0428/6427/9718/files/can_you_cast_cure_wounds_on_yourself.pdf
    • https://cdn.shopify.com/s/files/1/0427/5775/0951/files/senegevuku.pdf
    • https://cdn.shopify.com/s/files/1/0436/1050/5379/files/on_revolution_hannah_arendt.pdf
    • https://cdn.shopify.com/s/files/1/0429/2568/6951/files/zojidubu.pdf
    • https://cdn.shopify.com/s/files/1/0438/4541/9165/files/lime_in_the_coconut_song.pdf
    • https://cdn.shopify.com/s/files/1/0434/2821/6983/files/10227161721.pdf
    • https://cdn.shopify.com/s/files/1/0429/7133/2767/files/zawuvawula.pdf
    • https://cdn.shopify.com/s/files/1/0428/5048/4390/files/adages_erasmus.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_off0000624e.bin
6bb1891f72646d8b97085c6e31d0ddaa0e4ac8b91bae4bc5881f644e25d4eb06		 pdf-font-stream PDF embedded font (sfnt) at offset 0x624E 5232 bytes
font_01_sfnt_off0000741b.bin
d1b3660d800e583a60908afd6be8a4d759dccc5f99c5dcf6bd72209b28efed29		 pdf-font-stream PDF embedded font (sfnt) at offset 0x741B 10364 bytes
font_02_sfnt_off00009795.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9795 4324 bytes

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