Malicious PDF — malware analysis report

Static analysis result for SHA-256 643538d90df5078e…

MALICIOUS

PDF

40.5 KB Created: 2020-08-06 10:24:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 930188e7f744d1541be946f5ff1d67c8 SHA-1: fb5a9158e3e62feb99f9cdc18939374644484de0 SHA-256: 643538d90df5078ea6a4f1cdcdf638a1b32b913a53b7bf368ae3ed9ed6892fa5
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, with a critical heuristic identifying a malicious redirector at 'https://ttraff.com/pify?keyword=addition+subtraction+worksheets+pdf'. The document body, though heavily obfuscated, also contains this URL, suggesting an attempt to trick users into visiting a malicious site. The presence of a large number of external PDF links further supports a link farm or redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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=addition+subtraction+worksheets+pdf
    • http://files.undertheskyevents.org/uploads/1/3/0/8/130813516/fd479eef.pdf
    • http://files.findingspecies.org/uploads/1/3/2/7/132741709/642144.pdf
    • http://files.singlesretreat.net/uploads/1/3/0/7/130775126/334d77d2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/85755015361.pdf
    • https://cdn.shopify.com/s/files/1/0429/3882/6918/files/33233205446.pdf
    • https://cdn.shopify.com/s/files/1/0432/1322/6143/files/bamunobokizusam.pdf
    • https://cdn.shopify.com/s/files/1/0443/0426/9468/files/money_making_guide_rs3.pdf
    • https://cdn.shopify.com/s/files/1/0432/2230/2888/files/41073812199.pdf
    • https://cdn.shopify.com/s/files/1/0434/8814/9668/files/21612980654.pdf
    • https://cdn.shopify.com/s/files/1/0431/6728/5410/files/kutoxixavemiluvu.pdf
    • https://cdn.shopify.com/s/files/1/0427/6482/8838/files/98730584439.pdf
    • https://cdn.shopify.com/s/files/1/0436/1663/2992/files/ab_wheel_workout_routine.pdf
    • https://cdn.shopify.com/s/files/1/0437/2388/2664/files/tonememamuzopuraji.pdf
    • https://cdn.shopify.com/s/files/1/0451/4558/7877/files/domestic_violence_act_kenya.pdf
    • https://cdn.shopify.com/s/files/1/0428/4937/0268/files/81833272738.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005f1f.bin
b59d4fc3a93afc973265422d808263db9351b9ed189f55da4e7cf10f89d30a2c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F1F 5496 bytes
font_01_sfnt_off000071da.bin
f2824ff5744e77d129042985adf1a02e15775e6af9ad2d57e5f7cab88d3550f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71DA 10352 bytes

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