Malicious PDF — malware analysis report

Static analysis result for SHA-256 53837b26526c9536…

MALICIOUS

PDF

43.3 KB Created: 2020-08-23 20:39:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b3fa67fe61d4f3c94f66e86da7d019ad SHA-1: 55fd977b1e0a5924e681ef1ac7e44d0253088d2d SHA-256: 53837b26526c9536eeb7402cd2c492368a18a6a49efc14e5db07159c19947b04
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm hosted on cdn.shopify.com. One of these links, ttraff.ru, is identified as a malicious redirector. The document body, though heavily obfuscated, contains the URL to the malicious redirector, suggesting the primary intent is to direct users to malicious infrastructure. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=eur+j+inorg+chem+template
    • http://files.guitarplaytime.co.uk/uploads/1/3/1/3/131383943/1c9c3cee7e.pdf
    • http://files.llaycommunitychurch.com/uploads/1/3/1/4/131482931/xevemapusigozikaxuse.pdf
    • http://files.ripplingheartsstudio.com/uploads/1/3/1/3/131383398/xavabinuroji.pdf
    • http://files.rosemaryswords.com/uploads/1/3/0/7/130775085/fuvowuxeruzesi.pdf
    • https://cdn.shopify.com/s/files/1/0463/0862/2493/files/mah-_mba_mms-_cet_2019_score_card.pdf
    • https://cdn.shopify.com/s/files/1/0429/7831/2355/files/bromatologia_carnes.pdf
    • https://cdn.shopify.com/s/files/1/0435/9690/6659/files/zakubururatunabewilat.pdf
    • https://cdn.shopify.com/s/files/1/0439/8641/9870/files/sukibik.pdf
    • https://cdn.shopify.com/s/files/1/0431/8897/7813/files/13181361084.pdf
    • https://cdn.shopify.com/s/files/1/0438/3503/1712/files/wuwoboxof.pdf
    • https://cdn.shopify.com/s/files/1/0433/9712/0154/files/zitopekum.pdf
    • https://cdn.shopify.com/s/files/1/0428/5785/7187/files/16585804209.pdf
    • https://cdn.shopify.com/s/files/1/0437/7319/8487/files/1471510292.pdf
    • https://cdn.shopify.com/s/files/1/0440/5395/4710/files/autoresetevent_vs_manualresetevent_in_c_example.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_off00006bfd.bin
0be4152356e2f3bb71c23e0658cc739bb0315792c17453e829b7160d9c5d5238		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BFD 5200 bytes
font_01_sfnt_off00007d89.bin
86a282865954f266234ce78f6a8b5ce4dd0489ef78cb8881bc514d6fa18cedee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D89 10304 bytes

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