Malicious PDF — malware analysis report

Static analysis result for SHA-256 d87653ccc845d8d5…

MALICIOUS

PDF

38.9 KB Created: 2020-08-11 08:52:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2f68c3259bb65749dedb7a7f6ff9098f SHA-1: 8e4bb2a754562cc35c6c9ccaede45b968ac61e48 SHA-256: d87653ccc845d8d517b871e6b67c2f2544d123f23b3bd18100d6063786bda221
152 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier as malicious and contains a large number of embedded links, including one pointing to a known malicious redirector. The document body and embedded links suggest a link farm or SEO poisoning tactic, likely designed to lure users to malicious sites. The primary malicious URL identified is https://ttraff.ru/pify?keyword=alcoholics+anonymous+big+book+fourth+edition+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=alcoholics+anonymous+big+book+fourth+edition+pdf
    • http://files.vullowisp.com/uploads/1/3/1/4/131438337/dadajixarofaxit.pdf
    • http://files.officialjonathanmiller.com/uploads/1/3/1/4/131410007/fomere.pdf
    • http://files.myersreece.com/uploads/1/3/0/7/130776444/biwonorebop.pdf
    • http://files.en.todaysteachingtools.com/uploads/1/3/0/8/130874324/sezijomuragobogapofi.pdf
    • http://fejixedek.wesawa.org/uploads/1/3/1/1/131164250/midumituku-lotolunofoxiw-fototusunonobu-penutesalil.pdf
    • https://cdn.shopify.com/s/files/1/0432/8249/7701/files/skyrim_creation_kit_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0429/2929/1427/files/hsc_bm_book.pdf
    • https://cdn.shopify.com/s/files/1/0431/1659/3312/files/35961249307.pdf
    • https://cdn.shopify.com/s/files/1/0433/9033/7182/files/letisifujesufapeda.pdf
    • https://cdn.shopify.com/s/files/1/0430/6737/5770/files/91018701680.pdf
    • https://cdn.shopify.com/s/files/1/0430/3604/9571/files/43258482955.pdf
    • https://cdn.shopify.com/s/files/1/0428/5713/6294/files/67788096107.pdf
    • https://cdn.shopify.com/s/files/1/0430/0580/4698/files/23131036828.pdf
    • https://cdn.shopify.com/s/files/1/0438/5990/2624/files/null_and_alternative_hypotheses.pdf
    • https://cdn.shopify.com/s/files/1/0435/1367/5928/files/rejadogojerojutokarapu.pdf
    • https://cdn.shopify.com/s/files/1/0435/4061/1226/files/sumolawifamamomid.pdf
    • https://cdn.shopify.com/s/files/1/0428/7037/4559/files/data_analysis_books.pdf
    • https://cdn.shopify.com/s/files/1/0440/7456/5784/files/body_language_in_business_decoding_the_signals.pdf
    • https://cdn.shopify.com/s/files/1/0440/6562/0118/files/79583090896.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005779.bin
fd26e5346004843cd276850f1ca45eb934339b3cba1da9d63445fbbe2ba597dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5779 5864 bytes
font_01_sfnt_off00006b3f.bin
3c2b16f5c815b6009ca2ba08d357526d6517a8e9302e2cdfdebdcac0349ce8a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B3F 10232 bytes

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