Malicious PDF — malware analysis report

Static analysis result for SHA-256 397e0941469e18f0…

MALICIOUS

PDF

59.0 KB Created: 2020-08-06 02:14:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ecde72ffa1dd91c329d2f778a34635a0 SHA-1: 447efb1b2cae30c7da1cb9895aace52f52b8dec0 SHA-256: 397e0941469e18f09d2c4a52a130f959533acd9864f3af866260c0104aa85028
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a malicious redirector link disguised as a 'home design catalog pdf'. The link leads to 'https://ttraff.ru/pify?keyword=home+design+catalog+pdf', which is flagged as malicious. The document also hosts a large number of external PDF links, many pointing to Shopify, likely as part of an SEO spam or link farm tactic to improve search engine ranking for malicious content. The ML classifier strongly indicated 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.ru/pify?keyword=home+design+catalog+pdf
    • http://files.denveralpineclub.com/uploads/1/3/2/7/132740296/wivuvaxit_garukedolak_vimer.pdf
    • http://kixigegag.rockymountainprospectors.com/uploads/1/3/1/4/131407406/79944295603c.pdf
    • http://files.thewhitefamilyreunionisaiahcarrie.com/uploads/1/3/0/7/130740483/rikakufejebadanaxuv.pdf
    • http://files.realestate-investment-australia.com/uploads/1/3/1/4/131437848/95409b70fa5cfd.pdf
    • http://files.hurstancientdiscoveries.com/uploads/1/3/0/9/130969695/moxebafugilotafu.pdf
    • https://cdn.shopify.com/s/files/1/0434/0419/8038/files/86871621007.pdf
    • https://cdn.shopify.com/s/files/1/0430/7851/6885/files/simple_present_tense_exercise_with_answer.pdf
    • https://cdn.shopify.com/s/files/1/0433/0671/3253/files/68951095964.pdf
    • https://cdn.shopify.com/s/files/1/0428/6296/8991/files/jizalalun.pdf
    • https://cdn.shopify.com/s/files/1/0429/5226/1795/files/nepazizesorinipives.pdf
    • https://cdn.shopify.com/s/files/1/0434/1799/3366/files/u_bahn_plan_berlin_2020.pdf
    • https://cdn.shopify.com/s/files/1/0431/9064/8996/files/97197356761.pdf
    • https://cdn.shopify.com/s/files/1/0432/2502/2621/files/27467320488.pdf
    • https://cdn.shopify.com/s/files/1/0431/1433/2309/files/jupavonojitewevel.pdf
    • https://cdn.shopify.com/s/files/1/0433/2696/3865/files/36080911622.pdf
    • https://cdn.shopify.com/s/files/1/0429/4659/2924/files/zixiso.pdf
    • https://cdn.shopify.com/s/files/1/0431/7442/8827/files/godekezikurogigar.pdf
    • https://cdn.shopify.com/s/files/1/0428/2748/1255/files/kanizositanunizakamipepo.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_off0000a92d.bin
104106b9e8d0734d2956cc1a302fab77351c87ffc03d864bb3fd5b43e239ff26		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA92D 5340 bytes
font_01_sfnt_off0000bb4c.bin
b7ef46b90e729a7d3115584c7b161da2bc75904bf7522e5842c455eeb7795641		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBB4C 10420 bytes

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