Malicious PDF — malware analysis report

Static analysis result for SHA-256 7526f43bcaf77f61…

MALICIOUS

PDF

37.7 KB Created: 2020-08-22 07:10:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6bc75fead70ab3906c87b9000723af32 SHA-1: faa39d2efeb88166265bd0f04eabe883cd2386a1 SHA-256: 7526f43bcaf77f61afff722977af709e51092275e52dcdf058b2646c2f726160
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged as malicious by a machine learning classifier and contains a large number of external links, many of which point to potentially malicious redirectors or are part of a link farm. One of the primary links directs to 'ttraff.ru', a known malicious redirector. The document body contains garbled text but also includes the same URL, suggesting an attempt to disguise the malicious intent. The presence of numerous links indicates a likely attempt to manipulate search engine rankings or distribute malware through a large network of hosted PDFs.

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=twin+xl+fitted+sheets+percale
    • http://julutufa.todoferretero.cl/uploads/1/3/1/4/131408071/zaxunepiledolinaba.pdf
    • http://kidulena.lizziemahoneypaintings.net/uploads/1/3/1/4/131453784/jogoduvi_fodulatud.pdf
    • http://jodik.visitsmithcountyms.org/uploads/1/3/1/8/131856158/ee45bf7.pdf
    • http://raduwiko.genesislactation.com/uploads/1/3/0/7/130739873/588420.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0433/9580/9431/files/43997725011.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/wotedosepano.pdf
    • https://cdn.shopify.com/s/files/1/0431/9641/6160/files/28536243663.pdf
    • https://cdn.shopify.com/s/files/1/0429/5458/8316/files/gipikodowaz.pdf
    • https://cdn.shopify.com/s/files/1/0447/9988/5463/files/types_of_assessment_methods_in_teaching.pdf
    • https://cdn.shopify.com/s/files/1/0430/6341/0839/files/cute_baby_boy_photos_free.pdf
    • https://cdn.shopify.com/s/files/1/0437/4455/9258/files/silk_browser_fr_android_tv.pdf
    • https://cdn.shopify.com/s/files/1/0437/1188/9573/files/cancer_journals_audre_lorde.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004a0b.bin
a0e6c373156e4dc6591130d76f4157c8bcf3578672592b4c4bf626b8a10a18eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4A0B 5032 bytes
font_01_sfnt_off00005b24.bin
d8bf83566851e5b83b088f90f765056c362d84584b9a0126874eb32ff60d6b33		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B24 9736 bytes
font_02_sfnt_off00007c8e.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C8E 4324 bytes

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