Malicious PDF — malware analysis report

Static analysis result for SHA-256 56c9ba1b2cc57f94…

MALICIOUS

PDF

75.6 KB Created: 2020-08-06 09:39:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a194b20e4c917cd25584aa884ffa6989 SHA-1: fb103b4d7487e02bed52f0acbbbf0d74597397c0 SHA-256: 56c9ba1b2cc57f94c5030aca40a0c1efd8c3b377361f789d77e094cc3af10c4c
150 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to a URL designed to appear as a free download for a computer science book. This is a common lure for phishing or malware distribution. The PDF_MALICIOUS_REDIRECTOR_LINK heuristic firing confirms the malicious nature of the redirector, and the PDF_SEO_LINK_FARM heuristic indicates a large number of similar links are being generated.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=11th+computer+science+book+pdf+free+download
    • http://files.urbanreach.com.au/uploads/1/3/1/4/131438018/1209909.pdf
    • http://files.lifepointbiblestudy.org/uploads/1/3/1/0/131071043/zetisake.pdf
    • http://files.thefashionanalyst.com/uploads/1/3/1/3/131383624/wezunawe.pdf
    • http://files.chisigmaalpha.net/uploads/1/3/1/3/131383837/vewukiniwerak.pdf
    • http://files.ppitowing.net/uploads/1/3/2/6/132695707/vixikuzokitejude.pdf
    • https://cdn.shopify.com/s/files/1/0437/2873/2314/files/nazusexibujewusagomige.pdf
    • https://cdn.shopify.com/s/files/1/0433/7749/2118/files/automatic_frequency_control.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nowivozepax.pdf
    • https://cdn.shopify.com/s/files/1/0429/9476/1877/files/meruketedexuriwodini.pdf
    • https://cdn.shopify.com/s/files/1/0428/9078/9020/files/mukeweroraxuzixezawo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9481/9484/files/7906273203.pdf
    • https://cdn.shopify.com/s/files/1/0450/6664/9750/files/aromaterapia_egipcia.pdf
    • https://cdn.shopify.com/s/files/1/0429/8348/9690/files/87078064265.pdf
    • https://cdn.shopify.com/s/files/1/0438/2969/0525/files/html_emoji_list.pdf
    • https://cdn.shopify.com/s/files/1/0430/7438/8119/files/munibagij.pdf
    • https://cdn.shopify.com/s/files/1/0431/7321/6411/files/makidegef.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0000c1a8.bin
43128dd144a673ce72f2ae928d05250c3e10ab2c8073707c5792d53e257f01ef		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xC1A8 20284 bytes
font_00_sfnt_off0000ae8f.bin
4f7b4ed398e448f09ed9ab40a902d5493cdaebab5c6a7bec06a0e8528002d73f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAE8F 5648 bytes
font_02_sfnt_off0000ed59.bin
c841dc7702f28f613c84d6bd9b50c4969c9e50ed7f307b4e5fa452f14457e8b8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED59 12200 bytes
font_03_sfnt_off00011494.bin
d7a1248cabf161ff78a072bd924b98f1b4e551660f4e151c9433689786990c0c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11494 2832 bytes

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