Malicious PDF — malware analysis report

Static analysis result for SHA-256 4892ac1bdb723c25…

MALICIOUS

PDF

101.4 KB Created: 2020-08-29 17:37:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 19e6637fddfd77c948b2bf83b8abe589 SHA-1: b0f4d6f0fcbeace7b8452698080e5dfcdaa95465 SHA-256: 4892ac1bdb723c251af7cb278ec6cb36d30faa470405f6a6e2e8d0c9014b8a82
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one pointing to a known malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting a tactic to manipulate search engine results or distribute further malicious content. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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.com/wix?keyword=%25D9%2583%25D9%2585+%25D9%2585%25D9%2586+%25D8%25A7%25D9%2584%25D9%2588%25D9%2582%25D8%25AA+%25D9%2584%25D8%25AE%25D8%25A8%25D8%25B2+%25D8%25B1%25D9%2582%25D8%25A7%25D8%25A6%25D9%2582+%25D8%25A7%25D9%2584%25D8%25B4%25D9%2588%25D9%2583%25D9%2588%25D9%2584%25D8%25A7%25D8%25AA%25D9%2587+%25D9%2581%25D9%258A
    • https://static.usrfiles.com/ugd/b8c837_577d03c2bc6a44589703ca04f8528cd5.pdf
    • https://static.usrfiles.com/ugd/b8c837_0a4efbfdb90b458abc7854d09df9785c.pdf
    • https://static.usrfiles.com/ugd/b8c837_efc6fe953ec6424396a962789aae88c5.pdf
    • https://static.usrfiles.com/ugd/b8c837_b4105a9085274f2aa15636327422548c.pdf
    • https://static.usrfiles.com/ugd/fd3290_41de9b73b3fb440eaba31ac16eb921ad.pdf
    • https://static.usrfiles.com/ugd/b8c837_c86cb1598eb6493585615c847688f11f.pdf
    • https://static.usrfiles.com/ugd/dfb5f8_1e6aa389917748128ade646dbb6125eb.pdf
    • https://static.usrfiles.com/ugd/b8c837_2c2ee0dedd6a448a91324ba382142939.pdf
    • https://cdn.shopify.com/s/files/1/0437/6189/3534/files/rozijele.pdf
    • https://cdn.shopify.com/s/files/1/0433/7644/3557/files/73468900924.pdf
    • https://cdn.shopify.com/s/files/1/0431/7039/8372/files/17647775202.pdf
    • https://cdn.shopify.com/s/files/1/0432/6562/2184/files/emotional_quotient_inventory_youth_version.pdf
    • https://cdn.shopify.com/s/files/1/0431/2052/5476/files/characteristics_of_effective_business_communication.pdf
    • https://cdn.shopify.com/s/files/1/0438/9902/7611/files/bizigegiwu.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off00013dd3.bin
bdc561e4bb4da09db3e7f559e103de8a3ad6b4a6134a08df87773d523a24c0b5		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x13DD3 32800 bytes
font_00_sfnt_off0000f149.bin
b6ec58749aedf04a32bcbe83089c7b58d6f89fb98c48551fcd4be745f6f6cc06		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF149 3396 bytes
font_01_sfnt_off0000fc52.bin
83b520b4cc784cb0e39816be66e448392ae649e39e52e4a88ef41d50d2aacf12		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC52 18980 bytes
font_02_sfnt_off00011acb.bin
f739c4dfafe9c4bc19c79543f13b909ce63550dd7c3f4ca4ae79dcd9b9eae05e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11ACB 11140 bytes
font_04_sfnt_off000176a0.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x176A0 4324 bytes

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