Malicious PDF — malware analysis report

Static analysis result for SHA-256 827ab47a99e411fb…

MALICIOUS

PDF

39.4 KB Created: 2020-08-22 13:03:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e66558d45c84abdeff4ca6db26dec1a1 SHA-1: 64e0b607b5aecc71fb0c60dafbaecc9e7c2b862c SHA-256: 827ab47a99e411fb1724666dacc7daa4e2897d163e7de9d7376014aa2f8ec280
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.ru'. The document body, though heavily obfuscated, contains the same URL and text related to 'messenger apk android 1', suggesting a lure for users to download potentially malicious applications. The PDF also contains a large number of external links, many hosted on Shopify, indicating a link farm strategy. The ML classifier strongly supports the malicious nature of this PDF.

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=messenger+apk+android+1
    • http://files.intergenerate.net/uploads/1/3/1/8/131856119/4912620.pdf
    • https://cdn.shopify.com/s/files/1/0430/5757/8138/files/deep_purple_bloodsucker_tab.pdf
    • https://cdn.shopify.com/s/files/1/0430/8228/5216/files/17190813258.pdf
    • https://cdn.shopify.com/s/files/1/0427/5086/9671/files/accrual_accounting_examples.pdf
    • https://cdn.shopify.com/s/files/1/0428/8220/3811/files/memutikiluledibubuteselib.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/lalosukiwafigoledexefes.pdf
    • https://cdn.shopify.com/s/files/1/0432/3806/4296/files/64052162686.pdf
    • https://cdn.shopify.com/s/files/1/0428/6083/9079/files/fivej.pdf
    • https://cdn.shopify.com/s/files/1/0438/6462/1216/files/anhalteweg_bremsweg_reaktionsweg_formeln.pdf
    • https://cdn.shopify.com/s/files/1/0432/2839/7732/files/zavipasutitewo.pdf
    • https://cdn.shopify.com/s/files/1/0430/4302/9143/files/please_find_attached_my_application_form.pdf
    • https://cdn.shopify.com/s/files/1/0430/6678/5949/files/85508707695.pdf
    • https://cdn.shopify.com/s/files/1/0431/0532/1109/files/dixolelog.pdf
    • https://cdn.shopify.com/s/files/1/0429/6402/5493/files/zosut.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_off00004ec1.bin
75f900ef7b573620cc77c57ea43e7adeadfcb49de5adf60f40997d741351c1ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4EC1 4924 bytes
font_01_sfnt_off00005f8b.bin
22fcfea3d00c30862edbcccaed5564bfcbcf27fc044d0e5dc2e3430ae9b46df1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F8B 10308 bytes
font_02_sfnt_off000082d9.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x82D9 4324 bytes

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