Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bc116d8ce012e0f…

MALICIOUS

PDF

48.1 KB Created: 2020-08-09 14:53:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e6ace9aef3492c94fc5fbd9b180ee44f SHA-1: 2568351dc56d4651260414fd83b81b9d530c1468 SHA-256: 4bc116d8ce012e0f73861b9c059bbed94ed3d24d9323e9b08bac62a1de480264
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector. The primary malicious URL identified is https://ttraff.com/pify?keyword=waterfall+process+model+pdf, which is likely used to funnel victims to a phishing or malware distribution site. The ML classifier also strongly indicated maliciousness. The document body text is heavily obfuscated and contains 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.com/pify?keyword=waterfall+process+model+pdf
    • http://files.designersink.us/uploads/1/3/2/6/132681855/8325908.pdf
    • http://files.livelikeme.info/uploads/1/3/1/8/131856100/d8711dc04d.pdf
    • http://wapulun.bwwt.us/uploads/1/3/1/4/131438641/sunakubogepunonek.pdf
    • http://files.grcchoirs.org/uploads/1/3/1/4/131437676/002dfa0a.pdf
    • http://files.joysmith.net/uploads/1/3/0/7/130775557/xubitepojalavogok.pdf
    • https://cdn.shopify.com/s/files/1/0436/3635/9326/files/romozetufixisaze.pdf
    • https://cdn.shopify.com/s/files/1/0434/4181/5718/files/a1244_transistor.pdf
    • https://cdn.shopify.com/s/files/1/0432/5857/7046/files/34831225229.pdf
    • https://cdn.shopify.com/s/files/1/0427/7446/2631/files/nejamixelojuponiraj.pdf
    • https://cdn.shopify.com/s/files/1/0430/5420/3031/files/analogies_worksheet_grade_3.pdf
    • https://cdn.shopify.com/s/files/1/0433/8044/1238/files/barney_i_love_you_song.pdf
    • https://cdn.shopify.com/s/files/1/0440/8590/3525/files/51843047885.pdf
    • https://cdn.shopify.com/s/files/1/0431/0584/5397/files/ninivutudefozusafazejole.pdf
    • https://cdn.shopify.com/s/files/1/0429/8578/3447/files/28667225194.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/takuz.pdf
    • https://cdn.shopify.com/s/files/1/0434/7035/6632/files/63525414518.pdf
    • https://cdn.shopify.com/s/files/1/0428/7230/7875/files/28319481241.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_off00007327.bin
7df979fa8dd4a610f326a65c6e85011c37dc5802edc317fbe602ce1cac0680bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7327 4948 bytes
font_01_sfnt_off00008403.bin
96c7214a0560a4095031e5acad3672871a7445a67094c8dd8bc1c095830d747a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8403 9744 bytes
font_02_sfnt_off0000a551.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA551 4324 bytes

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