Malicious PDF — malware analysis report

Static analysis result for SHA-256 996f028799c6ef6e…

MALICIOUS

PDF

47.2 KB Created: 2020-08-19 19:12:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dc02cf1b0c426ee973f261913147d1fd SHA-1: af817563b27685bbde378fed4ca227f9395b20c4 SHA-256: 996f028799c6ef6e8f32f2e865ac83bdde5f45598433d541b1247b0225cbe8bc
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a malicious redirector. The primary malicious link, https://ttraff.cc/pify?keyword=bobby+brown+greatest+hits, is designed to lead users to potentially harmful content. The presence of a large number of external PDF links, many hosted on shopify.com, suggests a link farm or SEO poisoning tactic to increase visibility and lure victims. The ML classifier strongly indicated maliciousness.

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.cc/pify?keyword=bobby+brown+greatest+hits
    • http://files.marisatcohen.com/uploads/1/3/1/0/131071253/4d7bee4067d.pdf
    • http://nekafumuv.wildrootsyoga.com/uploads/1/3/0/9/130969744/9513113.pdf
    • http://wusesagu.100menwhocarequinte.com/uploads/1/3/2/7/132712207/d8ac978.pdf
    • http://files.kelseyblotter.com/uploads/1/3/2/6/132681488/4997005.pdf
    • https://cdn.shopify.com/s/files/1/0433/4066/0891/files/wodap.pdf
    • https://cdn.shopify.com/s/files/1/0430/6858/8194/files/fight_arena_osrs.pdf
    • https://cdn.shopify.com/s/files/1/0445/5153/6799/files/anthropocene_book.pdf
    • https://cdn.shopify.com/s/files/1/0429/1965/7628/files/7235003676.pdf
    • https://cdn.shopify.com/s/files/1/0443/9402/1030/files/evaluating_and_distinguishing_deductive_and_inductive_reasoning.pdf
    • https://cdn.shopify.com/s/files/1/0432/5716/8027/files/wesejepig.pdf
    • https://cdn.shopify.com/s/files/1/0431/9313/9364/files/dodge_ram_service_manual_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/0609/9605/files/kelebibogulorebu.pdf
    • https://cdn.shopify.com/s/files/1/0438/6009/9222/files/20168730401.pdf
    • https://cdn.shopify.com/s/files/1/0437/8116/1111/files/kuvikedirodujawitawufezat.pdf
    • https://cdn.shopify.com/s/files/1/0428/1905/9868/files/learn_english_via_listening_level_3.pdf
    • https://cdn.shopify.com/s/files/1/0435/8583/1070/files/gavonebo.pdf
    • https://cdn.shopify.com/s/files/1/0439/4647/5675/files/mmyvvdde_admission_form.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_off00006243.bin
139a005fa01ef27dd201f536509828fc04acb7df04b3821c85fda5199ca28319		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6243 5088 bytes
font_01_sfnt_off00007392.bin
0173729770feaf685cd6459c996f4d531f77e6a8ea9a64e084bee79ba056343c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7392 15036 bytes
font_02_sfnt_off0000a1fd.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA1FD 4324 bytes

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