Malicious PDF — malware analysis report

Static analysis result for SHA-256 d03a0f920baf5ba7…

MALICIOUS

PDF

44.8 KB Created: 2020-08-30 04:51:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 23bd2ffc91e4818d9afc00164f4c1c24 SHA-1: c85c6ff4e4cec36297f346812b5684b5b6e107e1 SHA-256: d03a0f920baf5ba7876d9242a53a91652987fff9155c7bd74ec65166773c5779
154 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of a link farm, containing numerous embedded URLs. One prominent URL, 'https://ttraff.ru/wix?keyword=total+war+warhammer+wood+elves', is flagged as a malicious redirector. The document body, though heavily obfuscated, appears to contain references to this URL and other PDFs hosted on Shopify and static.usrfiles.com, suggesting a coordinated effort to distribute malicious content or phish users. The ML classifier strongly supports the malicious verdict.

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/wix?keyword=total+war+warhammer+wood+elves
    • https://cdn.shopify.com/s/files/1/0447/8212/5205/files/shinto_rituals.pdf
    • https://cdn.shopify.com/s/files/1/0437/1516/6357/files/activate_microsoft_office_2010.pdf
    • https://cdn.shopify.com/s/files/1/0430/5354/7677/files/aashiqui_2_movie_1080p_kickass.pdf
    • https://cdn.shopify.com/s/files/1/0431/0496/0661/files/sabbath_school_lesson_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/1021/9432/files/medicinal_chemistry_of_antimalarial_drugs.pdf
    • https://static.usrfiles.com/ugd/80c1db_2fafce7f86b94b718cb9c311525b81b3.pdf
    • https://static.usrfiles.com/ugd/69695d_46b68a34c2d1472eadf70a4a243626f6.pdf
    • https://static.usrfiles.com/ugd/8b9728_27fa9479d1c34991b24889a2cc2854e4.pdf
    • https://static.usrfiles.com/ugd/51c472_71d1dcfc16a94b3aa04020c903862de2.pdf
    • https://static.usrfiles.com/ugd/48d9a1_6d0c5e8df49c456cb2c728f0dbd370fd.pdf
    • https://cdn.shopify.com/s/files/1/0430/1278/4277/files/kowupupesewatez.pdf
    • https://cdn.shopify.com/s/files/1/0433/6402/4479/files/suzozitusinuwozoluwe.pdf
    • https://cdn.shopify.com/s/files/1/0438/0616/3104/files/free_baby_shower_cards_templates.pdf
    • https://static.usrfiles.com/ugd/9c0842_c28e77a8dd384851a3e19b8229e5fece.pdf
    • https://static.usrfiles.com/ugd/3f80ec_c995b6f5b07241cca60f51a54f474b69.pdf
    • https://static.usrfiles.com/ugd/b8c837_bc04256f963040b3814888959deb3872.pdf
    • https://static.usrfiles.com/ugd/b8c837_cecf95b44597474ba1ca4f49c80db083.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006d78.bin
069b731eca6d06f2d8edfd3c816c436754fdfc79d97e8d2e5532eb92d6f94d68		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D78 5164 bytes
font_01_sfnt_off00007efa.bin
d07830c167fe6e37255aacd55412315574ec76e3abfe82a2e1f44e124a0ff29d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7EFA 11228 bytes

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