Malicious PDF — malware analysis report

Static analysis result for SHA-256 7caaa8d32b21bd61…

MALICIOUS

PDF

47.0 KB Created: 2020-08-11 19:30:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ab6fc634e92658b7d0e6ee52412c7762 SHA-1: cfd07c44dc662067c2f58a151cafdfdaa19b9200 SHA-256: 7caaa8d32b21bd613bbb2bbb1bffa3a7c34b890c7b4d92f04d09cf3cf3ba8f2a
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains numerous links, including a critical redirector link to 'ttraff.ru', which is flagged as malicious. The document body, though heavily obfuscated, contains text suggesting it is a 'Cinderella story book PDF' and includes the malicious URL. The presence of a link farm and the ML classifier firing further support malicious intent. The primary attack pattern involves luring users to malicious sites via embedded links.

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.ru/pify?keyword=cinderella+story+book+to+read+pdf
    • http://gozame.winningthroughpeace.com/uploads/1/3/1/3/131379833/7924436.pdf
    • http://files.drredekopp.com/uploads/1/3/0/7/130739116/9fbdf.pdf
    • http://files.olliebrownillustration.com/uploads/1/3/0/9/130968996/wufureponedodekenax.pdf
    • https://cdn.shopify.com/s/files/1/0430/4352/0665/files/50510851228.pdf
    • https://cdn.shopify.com/s/files/1/0433/1310/2998/files/52933450580.pdf
    • https://cdn.shopify.com/s/files/1/0450/7874/1155/files/anesthesia_and_analgesia_in_laboratory_animals_2nd_edition.pdf
    • https://cdn.shopify.com/s/files/1/0432/6581/8789/files/6551548873.pdf
    • https://cdn.shopify.com/s/files/1/0429/8512/8090/files/ccna_study_guide_router_alley.pdf
    • https://cdn.shopify.com/s/files/1/0430/8982/1845/files/practical_multivariate_analysis.pdf
    • https://cdn.shopify.com/s/files/1/0429/8260/4963/files/88117640560.pdf
    • https://cdn.shopify.com/s/files/1/0429/6559/8364/files/simple_present_tense_worksheet_grade_4.pdf
    • https://cdn.shopify.com/s/files/1/0429/8443/9971/files/juxozawexumubo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/32773531818.pdf
    • https://cdn.shopify.com/s/files/1/0431/7272/4900/files/exercices_corrigs_barycentre_seconde_s.pdf
    • https://cdn.shopify.com/s/files/1/0431/9484/3298/files/34822320041.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_off000065f6.bin
08948f85a4cb14e5bf201004097b0a6512b7d4a2c0b0295b5638f7f5641430da
pdf-font-stream PDF embedded font (sfnt) at offset 0x65F6 5244 bytes
font_01_sfnt_off000077d2.bin
c9d1b3abda2f3b65bf55ed9b50c9c0050fba982564a9304858727c53ca82c4e9
pdf-font-stream PDF embedded font (sfnt) at offset 0x77D2 9932 bytes
font_02_sfnt_off00009a0c.bin
6e2ace9a746ee4f9f9ef39c85f1c6b60d38ca409dbc50e4347af3f6b4533fdcb
pdf-font-stream PDF embedded font (sfnt) at offset 0x9A0C 16120 bytes