Malicious PDF — malware analysis report

Static analysis result for SHA-256 82794fac1e5b4266…

MALICIOUS

PDF

42.8 KB Created: 2020-08-30 21:26:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ca535274a8bbdb433dc13bfebc56109b SHA-1: d78528750c5a46cb50765b7f9a774b24b46ccdef SHA-256: 82794fac1e5b426653a1da4c6cd41e4fee470f0f3d71bb0b5745b9854ca01b10
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1200 Hardware Addends T1059.001 PowerShell

The PDF file contains multiple embedded URLs, with one specifically pointing to a known malicious redirector (ttraff.cc). This redirector is designed to lure users to malicious sites, disguised as a legitimate Adobe download link. The presence of a large number of external PDF links, many hosted on Shopify, suggests a link farm or SEO poisoning tactic to distribute malicious content. The ML classifier strongly indicates maliciousness.

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=visit+http+%252F%252Fwww.adobe.com%252Fgo%252Facrrea
    • https://cdn.shopify.com/s/files/1/0434/5616/8093/files/noxalejativowigafixufutup.pdf
    • https://cdn.shopify.com/s/files/1/0435/7269/1099/files/3371147749.pdf
    • https://cdn.shopify.com/s/files/1/0431/3012/6496/files/administrao_da_produo_slack_2020.pdf
    • https://cdn.shopify.com/s/files/1/0433/0127/3758/files/62045464140.pdf
    • https://static.usrfiles.com/ugd/b8c837_8dc00927f9bc495dbb3696621fa70c90.pdf
    • https://static.usrfiles.com/ugd/b8c837_afd93b34cf5044dc8fdf7ef74441fcd7.pdf
    • https://static.usrfiles.com/ugd/6f53d7_eda8d1664e184eed8349d7a8c06e8647.pdf
    • https://static.usrfiles.com/ugd/b8c837_b8649b4894614051aeb2fadee47746f0.pdf
    • https://static.usrfiles.com/ugd/ce0e6d_aa8119d9e92943c0adc3a21ace9a4f16.pdf
    • https://static.usrfiles.com/ugd/b8c837_edf69bb546c44f0fb5b9fc92daf2d661.pdf
    • https://cdn.shopify.com/s/files/1/0432/3082/2555/files/core_java_interview_questions_for_experienced_selenium_testers.pdf
    • https://cdn.shopify.com/s/files/1/0435/1708/3803/files/6713022631.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000044af.bin
80aa055f4f6554b25e493341da1d3edadabf046fc0de08f350974f38dcad549d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x44AF 5404 bytes
font_01_sfnt_off00005728.bin
bbe43660e1602e1bd0f93519dc23a27648a80036b6682ce5131660dde9651c0d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5728 10340 bytes
font_02_sfnt_off00007a95.bin
e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A95 16204 bytes
font_03_sfnt_off00008fc3.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8FC3 4324 bytes

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