Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9e49744d2db0da0…

MALICIOUS

PDF

38.8 KB Created: 2020-08-31 09:44:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 30dc82a923a0a9eeb2789cd9980aabf7 SHA-1: 6c4efed0996818e06d0e0af12fa18b66249b4e79 SHA-256: d9e49744d2db0da030a0638ec76542d2757613fad04a4bcedf07e43d16ca9cda
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, with one identified as a malicious redirector. The heuristic firings indicate this is likely a link farm designed for SEO manipulation or to distribute further malicious content. The ML classifier strongly supports the malicious nature of this PDF.

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=2014+manga+del+brujo
    • https://cdn.shopify.com/s/files/1/0429/1782/2620/files/55891062035.pdf
    • https://cdn.shopify.com/s/files/1/0437/5596/2522/files/47259419646.pdf
    • https://cdn.shopify.com/s/files/1/0434/1989/3927/files/hashmap_get_key.pdf
    • https://cdn.shopify.com/s/files/1/0431/5663/5816/files/18608729334.pdf
    • https://cdn.shopify.com/s/files/1/0431/8180/1629/files/42875477299.pdf
    • https://cdn.shopify.com/s/files/1/0431/9543/3117/files/george_foreman_grill_steak_guide.pdf
    • https://cdn.shopify.com/s/files/1/0428/3197/0460/files/72680240159.pdf
    • https://cdn.shopify.com/s/files/1/0431/8442/3073/files/berenstain_bears_trick_or_treat.pdf
    • https://cdn.shopify.com/s/files/1/0431/8376/7713/files/dufelep.pdf
    • https://cdn.shopify.com/s/files/1/0435/6161/5519/files/addons_chrome_helper.pdf
    • https://cdn.shopify.com/s/files/1/0438/1881/1552/files/sutivivuwuminazakopaxov.pdf
    • https://static.usrfiles.com/ugd/73c254_c009de115aa64f2c82980e7f88f6be88.pdf
    • https://static.usrfiles.com/ugd/07e02c_d5a842454f374917b52fc9a5f7e40f8d.pdf
    • https://static.usrfiles.com/ugd/89363e_ab403db386d642479a5989f507820a50.pdf
    • https://static.usrfiles.com/ugd/3794ad_edc2a3ffaab7427493f84d675716bd68.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_off000056b0.bin
86e7e31e644ab2ff2906d60ac58bc2d970ff7438b4da6ee84f9da0d0d0a295a7
pdf-font-stream PDF embedded font (sfnt) at offset 0x56B0 5500 bytes
font_01_sfnt_off0000694d.bin
10726d12cef1efda77b1b149364ed9ed022c1526c775654677b9b7d1adb56bc3
pdf-font-stream PDF embedded font (sfnt) at offset 0x694D 10996 bytes