Malicious PDF — malware analysis report

Static analysis result for SHA-256 557e5347fe3b9b04…

MALICIOUS

PDF

42.0 KB Created: 2020-07-28 02:49:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f80310c7f8f0a562a3c6166d2c3c5938 SHA-1: 68505f1e9a887facd43895d55ff98ff9a9fe7610 SHA-256: 557e5347fe3b9b04fe9d0b0aaa943e77f5d71a99c22b2c986cda2b2b8139a023
152 Risk Score

Malware Insights

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

This PDF document contains multiple embedded links, with a primary link pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text related to "animated background images free", suggesting a lure to trick users into clicking the malicious links. The ML classifier also 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.ru/pify?keyword=animated+background+images+free
    • http://files.rubywebbscrochet.com/uploads/1/3/1/6/131636855/mugomijoni-nadozedajomo.pdf
    • http://files.theskinthatburns.com/uploads/1/3/1/1/131164534/f66e7e2f6bf.pdf
    • http://files.connect2learn.com/uploads/1/3/1/4/131407028/dasajafifitegonubiku.pdf
    • http://files.wordshandmade.com/uploads/1/3/2/6/132682610/folarumufumit.pdf
    • http://files.wordshandmade.com/uploads/1/3/2/6/132682610/folarum
    • https://cdn.shopify.com/s/files/1/0429/5104/9370/files/siralazimulug.pdf
    • https://cdn.shopify.com/s/files/1/0437/8106/2805/files/lejojifom.pdf
    • https://cdn.shopify.com/s/files/1/0432/3852/3047/files/3390736342.pdf
    • https://cdn.shopify.com/s/files/1/0431/0876/1764/files/13090712956.pdf
    • https://cdn.shopify.com/s/files/1/0427/4972/2790/files/rudugilojonow.pdf
    • https://cdn.shopify.com/s/files/1/0433/5144/1563/files/37769531035.pdf
    • https://cdn.shopify.com/s/files/1/0429/9610/5375/files/jinobopolodutekagovuwaj.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/lipowu.pdf
    • https://cdn.shopify.com/s/files/1/0431/2160/6817/files/bubagaropaxiwaxokuwikopel.pdf
    • https://cdn.shopify.com/s/files/1/0434/1995/9463/files/dozowemobawoj.pdf
    • https://cdn.shopify.com/s/files/1/0431/7030/0061/files/3826099097.pdf
    • https://cdn.shopify.com/s/files/1/0437/2489/8453/files/zasigenowevad.pdf
    • https://cdn.shopify.com/s/files/1/0437/4790/1592/files/zalobam.pdf
    • https://cdn.shopify.com/s/files/1/0434/0459/1254/files/57284539075.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_off00006013.bin
68f84e16d879a1856eed7c98e4a040bb794bc71e404de0095ed81794fe93c225		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6013 5384 bytes
font_01_sfnt_off00007241.bin
102d80247d5a74eb5b408feccbf44b0cd80b5e6a80d1dc837f6fbd2f4ddd35c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7241 12752 bytes

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