Malicious PDF — malware analysis report

Static analysis result for SHA-256 1aee4ebd41834749…

MALICIOUS

PDF

39.8 KB Created: 2020-08-24 10:23:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0dbf8450a062726f7139430e89704b20 SHA-1: d83160d26ee4b03d36d5e1f585cfbba8944999c6 SHA-256: 1aee4ebd41834749d9151bd43e1fdb35bfc2e00d550f9bb9c3cb070642d6a20d
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/pify?keyword=letter+h+worksheets'. Additionally, it features a PDF link farm heuristic, indicating a large number of external links, with 'https://cdn.shopify.com/s/files/1/0431/4991/8362/files/sodamatuveta.pdf' being the first listed. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the redirector URL, suggesting the primary intent is to drive users to malicious sites.

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.cc/pify?keyword=letter+h+worksheets
    • http://files.creativefooddrive.com/uploads/1/3/0/7/130740612/dozur.pdf
    • http://files.justajourney.org/uploads/1/3/1/3/131380390/3581767.pdf
    • http://files.healinginmotionpt.com/uploads/1/3/1/4/131453623/571db272dd.pdf
    • http://lusafova.jessicamaytaylor.co.uk/uploads/1/3/2/6/132695569/b66890a8f027da.pdf
    • https://cdn.shopify.com/s/files/1/0431/4991/8362/files/sodamatuveta.pdf
    • https://cdn.shopify.com/s/files/1/0437/7912/9501/files/61561243914.pdf
    • https://cdn.shopify.com/s/files/1/0430/7084/9181/files/66604752157.pdf
    • https://cdn.shopify.com/s/files/1/0431/4795/2294/files/baaghi_full_movie_2016.pdf
    • https://cdn.shopify.com/s/files/1/0429/9954/6009/files/liwaniwebutitakuxewunoji.pdf
    • https://cdn.shopify.com/s/files/1/0428/9812/9059/files/synology_ext4_vs_btrfs_performance.pdf
    • https://cdn.shopify.com/s/files/1/0462/3617/2437/files/business_plan_format_examples.pdf
    • https://cdn.shopify.com/s/files/1/0454/6569/8462/files/7499499826.pdf
    • https://cdn.shopify.com/s/files/1/0447/8880/9889/files/psychological_causes_of_stress.pdf
    • https://cdn.shopify.com/s/files/1/0432/2315/4850/files/fototropismo_vegetal.pdf
    • https://cdn.shopify.com/s/files/1/0432/3685/1874/files/naxidubupuvegemube.pdf
    • https://cdn.shopify.com/s/files/1/0437/5589/6983/files/59053769501.pdf
    • https://cdn.shopify.com/s/files/1/0435/2524/3039/files/77871562740.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_off00006010.bin
aaffacf680444fd1272d0b88169caaa2df3213b90e75cee063369236569900b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6010 4628 bytes
font_01_sfnt_off00006fde.bin
f31381d0aa91863c5ece879266bbd62b6f0bbd665d82d4695416b7b98d6462dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FDE 10136 bytes

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