Malicious PDF — malware analysis report

Static analysis result for SHA-256 e155de600d264ddc…

MALICIOUS

PDF

40.4 KB Created: 2020-09-02 19:25:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e2d2c98bb710421d30789344c5b7511e SHA-1: 1cc60ad81e83c2a3b8fa01d8e17f78a1f4b66afb SHA-256: e155de600d264ddc004253ea5bfb281a97c4d45fc95f04fd6af0da0ce23f0880
154 Risk Score

Malware Insights

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

The PDF document was flagged as malicious due to its inclusion of a redirector link to a known malicious domain (ttraff.com). Additionally, it contains a large number of embedded links pointing to various PDF files, suggesting a link farm or SEO spamming technique. The ML classifier strongly supports the malicious verdict. No scripts were extracted, and the document body was heavily obfuscated, preventing a deeper analysis of the lure.

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.com/wix?keyword=harley+quinn+wallpaper
    • https://static.usrfiles.com/ugd/e3834b_c3b3d3f0ed0d44a584dc626555f88698.pdf
    • https://static.usrfiles.com/ugd/73c254_03688344d5fd40b1920f6c79597f52c4.pdf
    • https://static.usrfiles.com/ugd/9eb187_b025f4b49d38409980cec510b479a3c7.pdf
    • https://static.usrfiles.com/ugd/7f46b5_299194b527034aae8750bd0471df92f2.pdf
    • https://static.usrfiles.com/ugd/24deb6_956d16e4f35e4d94ae45a5737dfc90a9.pdf
    • https://static.usrfiles.com/ugd/f1d680_15aebf1ebec043ceae594e1b7f46af31.pdf
    • https://static.usrfiles.com/ugd/cbe7f7_480e0c87407547eaa113dd93f196c16d.pdf
    • https://static.usrfiles.com/ugd/4ae4db_b007fc1a2cdd4a61b94e7e1852d1b4b4.pdf
    • https://static.usrfiles.com/ugd/33c377_a32889a8013d4b48934e56bc1237f471.pdf
    • https://cdn.shopify.com/s/files/1/0431/1485/6610/files/78313616375.pdf
    • https://cdn.shopify.com/s/files/1/0443/3153/2444/files/chrome_os_usb_bootable.pdf
    • https://cdn.shopify.com/s/files/1/0430/6888/3098/files/85631212389.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/radeziwiwilajumigetadad.pdf
    • https://cdn.shopify.com/s/files/1/0434/2182/7222/files/gakazopuxawunugigu.pdf
    • https://cdn.shopify.com/s/files/1/0439/1036/5339/files/cracking_the_millionaire_code.pdf
    • https://cdn.shopify.com/s/files/1/0431/6050/2421/files/dodupototamanin.pdf
    • https://cdn.shopify.com/s/files/1/0431/6083/0103/files/contrato_terapeutico_psicologico.pdf
    • https://cdn.shopify.com/s/files/1/0433/8181/7505/files/8706560400.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_off000052bc.bin
4c6509874c4e6b1474c5aa5b67c58ca4a507346339927dedc8bb2303735b9265		 pdf-font-stream PDF embedded font (sfnt) at offset 0x52BC 4916 bytes
font_01_sfnt_off0000639c.bin
36b67450aebe67eb7318a335598d0bd10dab501ed7da72fb9c17767b681741fa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x639C 15756 bytes

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