Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc18f9da433cf24f…

MALICIOUS

PDF

81.7 KB Created: 2020-10-11 16:32:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 07dac5d4a4ea7bebad2774c5c0b79d43 SHA-1: e6e819eb6f4d965dc6537f5c0de70a41d801dfa7 SHA-256: cc18f9da433cf24fd241c117a2fbef367b84aa87833158d0e797317171e65788
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm or SEO poisoning attempt. One of the primary links, https://gettraff.ru/strik?keyword=gloeocapsa+prokaryotic+or+eukaryotic, is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the malicious URL.

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://gettraff.ru/strik?keyword=gloeocapsa+prokaryotic+or+eukaryotic
    • http://files.ciarchitect.com/uploads/1/3/0/7/130739811/sulowisozidegeremo.pdf
    • http://xajebam.corenewal.org/uploads/1/3/1/0/131070571/xonex.pdf
    • http://files.moncarnetdelecture.com/uploads/1/3/0/8/130874430/9e5d7d9352619.pdf
    • http://files.rockphenoms.com/uploads/1/3/2/8/132815785/6dc05f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0482/5366/5442/files/bizelavubakula.pdf
    • https://cdn.shopify.com/s/files/1/0437/8260/2904/files/1045041418.pdf
    • https://cdn.shopify.com/s/files/1/0266/8327/7491/files/dhampir_5e_midgard.pdf
    • https://cdn.shopify.com/s/files/1/0440/7623/6950/files/toshiba_satellite_s70-bbt2n23_laptop_driver.pdf
    • https://cdn.shopify.com/s/files/1/0479/2906/5639/files/josenawazupowusuxes.pdf
    • https://cdn.shopify.com/s/files/1/0484/0377/5640/files/rick_and_morty_vs_dungeons_and_dragons_download.pdf
    • https://cdn.shopify.com/s/files/1/0438/2018/7805/files/gowetoxipobozomewusomof.pdf
    • https://cdn.shopify.com/s/files/1/0432/5313/7570/files/nulogazotovokusema.pdf
    • https://cdn.shopify.com/s/files/1/0481/3589/7251/files/abc_driver_education_cockeysville_md.pdf
    • https://cdn.shopify.com/s/files/1/0429/1965/7635/files/tekezezivav.pdf
    • https://cdn.shopify.com/s/files/1/0431/6712/1565/files/78429994044.pdf
    • https://cdn.shopify.com/s/files/1/0493/1973/9551/files/murray_38_inch_deck_belt.pdf
    • https://cdn.shopify.com/s/files/1/0492/7743/6060/files/ashbory_bass_review.pdf
    • https://cdn.shopify.com/s/files/1/0429/7474/0636/files/51180917947.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed07.bin
cbab925d8715d74ac62f40fee6a29828a9c130317d634b8c3471c8c65db21160		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED07 4900 bytes
font_01_sfnt_off0000fdce.bin
53ab316e4cd43a5cad7941a7c94f5c89cbec728fa62b90743bf7580e3307a44e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDCE 14648 bytes
font_02_sfnt_off00012b2e.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12B2E 4324 bytes

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