Malicious PDF — malware analysis report

Static analysis result for SHA-256 2130a89e74a91595…

MALICIOUS

PDF

49.3 KB Created: 2020-08-31 11:17:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dd99f3157113cc878a642b37abba17aa SHA-1: 81ce2e10e81d75ce6093f19caccd1f2dbaab4725 SHA-256: 2130a89e74a915950261c0d3fddac073cca71aee936641c006311cf8a207b4be
152 Risk Score

Malware Insights

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

The PDF contains a mass of external links, many of which are hosted on cdn.shopify.com and static.usrfiles.com, but one prominent link directs to a known malicious redirector at ttraff.club. The document body, though heavily obfuscated, contains the search query "when is the next lunar eclipse in 2016" and the malicious URL, suggesting a lure to trick users into clicking the malicious link. The ML classifier strongly flagged this PDF as malicious.

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.club/wix?keyword=when+is+the+next+lunar+eclipse+in+2016
    • https://static.usrfiles.com/ugd/1a89c8_dd6f263004224984bb4b76123852a2ee.pdf
    • https://static.usrfiles.com/ugd/565485_2b1bc9b65ce6401ab147f4c878b22085.pdf
    • https://static.usrfiles.com/ugd/f3ecbe_2324039249334e2ebb69951bafcbc2bf.pdf
    • https://cdn.shopify.com/s/files/1/0432/2784/0675/files/digejiper.pdf
    • https://cdn.shopify.com/s/files/1/0432/9514/6139/files/32523449997.pdf
    • https://cdn.shopify.com/s/files/1/0438/6881/5528/files/autosomal_dominant_and_recessive_disorders.pdf
    • https://cdn.shopify.com/s/files/1/0431/1557/7504/files/72004468559.pdf
    • https://cdn.shopify.com/s/files/1/0431/0145/4500/files/useful_chinese_characters_for_learners_of_korean.pdf
    • https://static.usrfiles.com/ugd/3826db_fdccaf4f022249738254a8b31ded601e.pdf
    • https://static.usrfiles.com/ugd/b8c837_4bddd9dbab824720ad073600196511af.pdf
    • https://cdn.shopify.com/s/files/1/0434/1124/3162/files/batman_arkham_asylum_graphic_novel.pdf
    • https://cdn.shopify.com/s/files/1/0434/8379/1526/files/fagiwogekanexasuzota.pdf
    • https://cdn.shopify.com/s/files/1/0429/9191/1066/files/week_by_week_pregnancy_chart.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/8357326041.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_off000074e4.bin
6b001d982346b0d98a3354f9ee0bdb938d0a072afc56913d84520664208445ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74E4 5356 bytes
font_01_sfnt_off00008714.bin
672a90d67f9c543b0eea4bafe7310b3cc8c60afe120ac011064ba0c920c85022		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8714 10264 bytes
font_02_sfnt_off0000aa2e.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAA2E 4324 bytes

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