Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bd53088848ffd9d…

MALICIOUS

PDF

45.3 KB Created: 2020-08-24 23:01:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c0f1ef9a21a78ea466b5f2aeb3c1faf4 SHA-1: d242e66b9947f0bd9c3e06682c42a60b84254e68 SHA-256: 0bd53088848ffd9d2d09519d62eb4a8345c834a39e19eb320511870d44c492c2
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link to a known malicious redirector, ttraff.ru, which is likely used to obscure the final malicious destination. The document body, though heavily obfuscated, contains the same URL and appears to be a lure for a 'WPS connect app free'. The heuristic PDF_SEO_LINK_FARM indicates a large number of external PDF links, suggesting a link farm or spamming operation. While no scripts were explicitly extracted, the presence of embedded URLs and the malicious redirector strongly suggest an attempt to lead the user to a malicious site, likely for phishing or malware distribution.

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=wps+connect+app+free
    • http://raredubir.rachelbrauer.com/uploads/1/3/1/4/131453329/girawubasenutop.pdf
    • http://files.dmawarenessmi.com/uploads/1/3/0/8/130813135/1924522.pdf
    • http://pikipifer.underonehour.com/uploads/1/3/1/4/131438428/gexokujibivaj.pdf
    • http://files.cristinamullins.com/uploads/1/3/1/6/131607662/nejew.pdf
    • http://xugazom.partmason.com/uploads/1/3/1/1/131164250/6047223.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/3111/7467/files/law_dictionary_english_to_myanmar.pdf
    • https://cdn.shopify.com/s/files/1/0434/0337/8839/files/16766917057.pdf
    • https://cdn.shopify.com/s/files/1/0433/5996/1239/files/huawei_p9_plus_android_7._0.pdf
    • https://cdn.shopify.com/s/files/1/0429/0979/4463/files/12088664449.pdf
    • https://cdn.shopify.com/s/files/1/0431/9110/7752/files/xofujiweseximejeror.pdf
    • https://cdn.shopify.com/s/files/1/0437/8873/0525/files/wadiwojumesok.pdf
    • https://cdn.shopify.com/s/files/1/0427/9864/5404/files/toberezupol.pdf
    • https://cdn.shopify.com/s/files/1/0434/4712/4130/files/analog_and_digital_sound.pdf
    • https://cdn.shopify.com/s/files/1/0429/7441/2949/files/yassarnal_quran_ahmadiyya.pdf
    • https://cdn.shopify.com/s/files/1/0438/0845/6865/files/friction_force_problems_worksheet.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/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005f7a.bin
99a26da2dadc4bcf693f60ef125f767e7d9b17aa6a692b45096283b71588967f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F7A 4992 bytes
font_01_sfnt_off0000708b.bin
8062f5a36ac5de7a80ce10f9192a4cca70a5060235bb5a6d0dd914bab1651ecc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x708B 10076 bytes
font_02_sfnt_off00009347.bin
f469c5aa689aa4c1965481b78cfaebbf1c3ebdad2306c7067134b7b4aaa0addd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9347 16164 bytes

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