Malicious PDF — malware analysis report

Static analysis result for SHA-256 da9c6add4572a97d…

MALICIOUS

PDF

50.3 KB Created: 2020-08-31 08:20:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f1fd5607ee2e9e5026bc2816bb4fb442 SHA-1: abf5d4c01a0a270472b65059ffdcb37ef531c112 SHA-256: da9c6add4572a97d73ba4ed59df3c92beb613bcee09f9d551d516d573b0805c6
152 Risk Score

Malware Insights

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

The PDF file was identified as malicious due to a critical heuristic firing for a link to known malicious redirector infrastructure. It also contains a large number of external PDF links, characteristic of a link farm. The primary malicious URL identified is https://ttraff.ru/wix?keyword=la+ense%25C3%25B1anza+de+las+matematicas+en+el+jardin+de+infantes+adriana+gonzalez, which is likely used to direct users to a phishing or malware-hosting site. The document body contains garbled text and embedded URLs, further supporting the malicious intent.

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=la+ense%25C3%25B1anza+de+las+matematicas+en+el+jardin+de+infantes+adriana+gonzalez
    • https://cdn.shopify.com/s/files/1/0440/0925/9158/files/beamng_drive_crashes_apk.pdf
    • https://cdn.shopify.com/s/files/1/0435/3730/1653/files/access_control_user_manual.pdf
    • https://cdn.shopify.com/s/files/1/0432/9121/3990/files/icnd1_practice_exam.pdf
    • https://cdn.shopify.com/s/files/1/0437/8899/2674/files/89192400407.pdf
    • https://cdn.shopify.com/s/files/1/0436/0667/1517/files/68125024331.pdf
    • https://static.usrfiles.com/ugd/b8c837_b02aa0ade46f4f23bf2127895aa77f3b.pdf
    • https://static.usrfiles.com/ugd/cc14e4_2145750533184d71b30adc0be954125f.pdf
    • https://static.usrfiles.com/ugd/b8c837_ac75a04afd304700b29211bb448dccc1.pdf
    • https://cdn.shopify.com/s/files/1/0433/6920/1832/files/wubujebixosomazigikanoran.pdf
    • https://cdn.shopify.com/s/files/1/0437/8099/7269/files/45013533243.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/72593533024.pdf
    • https://cdn.shopify.com/s/files/1/0440/3301/5958/files/segmentation_targeting_and_positioning_notes.pdf
    • https://cdn.shopify.com/s/files/1/0438/2274/3709/files/anthropology_study_guide.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_off00006807.bin
5a6b19d7ebd353b74f1402ada1ea3090c0bd9c1326954ac68795c07859e6875f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6807 5620 bytes
font_01_sfnt_off00007ad0.bin
1777a751aa7b14acfca182aa214d3653bcd33eae69c198a2c659ff33824773da		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7AD0 12600 bytes
font_02_sfnt_off0000a38a.bin
9af6fc3bf9d751f70540aea0fa47faa159a3604992cda23d2adcda3ffc5346b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA38A 16092 bytes

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