Malicious PDF — malware analysis report

Static analysis result for SHA-256 54434dce74bc029f…

MALICIOUS

PDF

41.8 KB Created: 2020-08-08 22:08:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c683a2201be42ec13396b09ca0295613 SHA-1: d9c4c244547628c15c5cd56e8352ff9a5eef53d1 SHA-256: 54434dce74bc029f9e0b9fad9734eecbd248fe659804e5a9076fe864b680a00f
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 document body, though heavily obfuscated, contains text related to 'adverbial phrases of time exercises pdf' and a URL pointing to a malicious redirector, suggesting a lure to a phishing or malware distribution site. 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.com/pify?keyword=adverbial+phrases+of+time+exercises+pdf
    • http://files.katieriffe.com/uploads/1/3/1/8/131856392/liketanafer.pdf
    • http://pobix.lajollyday.com/uploads/1/3/1/4/131406202/tomidipenozafez-zatibonow-lesidawato.pdf
    • http://files.hickmanfootball.com/uploads/1/3/0/7/130776788/kamubumul-dobozokowobiz.pdf
    • http://vatozib.littlegemskaren.co.uk/uploads/1/3/1/4/131453177/zitorunegaretotawi.pdf
    • http://kojowiki.asidtxstudentsymposium.org/uploads/1/3/1/3/131383483/4241939.pdf
    • https://cdn.shopify.com/s/files/1/0448/6037/5201/files/akbar_birbal_stories_in_english_with_pictures.pdf
    • https://cdn.shopify.com/s/files/1/0431/3127/3365/files/zavenomalofalejuloz.pdf
    • https://cdn.shopify.com/s/files/1/0429/1470/9670/files/bright_line_eating_14_day_challenge.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/58829080427.pdf
    • https://cdn.shopify.com/s/files/1/0431/1423/4013/files/padisenifekerurupa.pdf
    • https://cdn.shopify.com/s/files/1/0434/5335/0055/files/yagpdb_reaction_roles.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/lobusine.pdf
    • https://cdn.shopify.com/s/files/1/0428/5179/5107/files/handlebars_if_statement.pdf
    • https://cdn.shopify.com/s/files/1/0427/8022/9791/files/sixagibitinukexed.pdf
    • https://cdn.shopify.com/s/files/1/0428/7492/9319/files/kefozenulof.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/guwesimutetalajizobanubel.pdf
    • https://cdn.shopify.com/s/files/1/0432/6057/5912/files/31232799757.pdf
    • https://cdn.shopify.com/s/files/1/0432/3550/8392/files/vuladumevetefoturo.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_off00006286.bin
52b0b4010988e31e102b95d62680d744b002cb8e1e88b10e6d1e6ff9cee5fc85		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6286 5652 bytes
font_01_sfnt_off0000759b.bin
8057ea9e288d8ec34e65d39d49359566f8a85adca4484378ec0e42c16f5e7c8c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x759B 10132 bytes

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