Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c1b60a5b8b2b746…

MALICIOUS

PDF

44.6 KB Created: 2020-08-22 08:44:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b49bc81e8dbb1f7181450a6d1d93d8fe SHA-1: 6e39e120715ad129716905d4e5c0d7c00bd4b833 SHA-256: 1c1b60a5b8b2b746f9c366caaea3db35651fe32526e6ffbd332ba5e629ea2c12
150 Risk Score

Malware Insights

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

The PDF contains a high number of embedded links, many of which point to a redirector service. The primary malicious URL identified is ttraff.ru, which is used in conjunction with a keyword suggesting a lure for educational materials. The ML classifier strongly indicates maliciousness, and the PDF structure is consistent with link-farming techniques used for phishing or malware distribution.

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=beehive+9th+class+book
    • http://tapumoda.kinneycountygcd.org/uploads/1/3/0/8/130874493/4ce97.pdf
    • http://tatevak.thelight.org/uploads/1/3/2/3/132303338/1463817e7599.pdf
    • http://files.southforkprovisions.net/uploads/1/3/0/7/130776819/vosanisoniwegedel.pdf
    • http://pifibeluz.tinctureoftimellc.com/uploads/1/3/0/8/130873947/baponise-jemugizo.pdf
    • http://files.debbietuepah.com/uploads/1/3/1/6/131606094/noxef-xefeniwufutew-validizasuxoje-rebusag.pdf
    • https://cdn.shopify.com/s/files/1/0431/6345/1549/files/never_back_down_ost.pdf
    • https://cdn.shopify.com/s/files/1/0432/6447/5304/files/7925529683.pdf
    • https://cdn.shopify.com/s/files/1/0430/4207/8877/files/dewubolubidip.pdf
    • https://cdn.shopify.com/s/files/1/0433/5792/9623/files/finale_notepad_2012.pdf
    • https://cdn.shopify.com/s/files/1/0432/9888/1704/files/el_nacionalismo_musical.pdf
    • https://cdn.shopify.com/s/files/1/0435/9438/3522/files/movimiento_armonico_simple_definicion.pdf
    • https://cdn.shopify.com/s/files/1/0434/3024/8600/files/aeneid_lombardo.pdf
    • https://cdn.shopify.com/s/files/1/0437/7408/3233/files/new_antimalarial_drugs_2020.pdf
    • https://cdn.shopify.com/s/files/1/0436/0683/5358/files/vertically_opposite_angles_worksheet_grade_5.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_off00006634.bin
4d9348ab0881afef16331a39dee4ecf9b3287848c2aa1577909a88aef5c8cd89		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6634 5260 bytes
font_01_sfnt_off00007818.bin
28b5674ded3929e26abda414d42c0810f5760091817932faf0e01149250d57d1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7818 9956 bytes
font_02_sfnt_off00009a87.bin
9728a24ebd3faa82a0e45625fd261104bd7d479353b96a361d0c84e56246789d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9A87 2748 bytes

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