Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c1fba5377a6686d…

MALICIOUS

PDF

40.4 KB Created: 2020-08-11 23:56:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 34950efda1270ee67b8b467f8be116b6 SHA-1: cf43d9dbdc38980a903a961d21cf6abadef54853 SHA-256: 4c1fba5377a6686da5ef9a0865bff750c8a18a202152bac3e0437d363460dd8c
152 Risk Score

Malware Insights

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

This PDF contains a large number of embedded links, many pointing to Shopify domains hosting other PDFs, suggesting a link farm or SEO manipulation tactic. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.cc/pify?keyword=teori+sastra+marxisme+pdf'. The ML classifier strongly flagged this PDF as malicious. The document body text is heavily corrupted but contains the same suspicious 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://ttraff.cc/pify?keyword=teori+sastra+marxisme+pdf
    • http://files.xinzhangdesign.com/uploads/1/3/1/4/131437676/valazamojox.pdf
    • http://files.dreamswishestravel.com/uploads/1/3/2/6/132681901/sexodajuf-toziwipazebon.pdf
    • http://files.krislibrary.com/uploads/1/3/0/7/130740442/1fda0f35313.pdf
    • http://files.thaisrussomano.com/uploads/1/3/0/8/130874361/fapajawigibekus-kofarulodejo-lozosasat.pdf
    • https://cdn.shopify.com/s/files/1/0434/1307/8168/files/mupemokemizoderasabipukif.pdf
    • https://cdn.shopify.com/s/files/1/0448/3593/0273/files/cbse_class_10_board_exam_question_paper_2020.pdf
    • https://cdn.shopify.com/s/files/1/0429/1608/5916/files/jspdf_autotable_header_styles.pdf
    • https://cdn.shopify.com/s/files/1/0431/3038/8642/files/25669315557.pdf
    • https://cdn.shopify.com/s/files/1/0433/3584/3994/files/11559872797.pdf
    • https://cdn.shopify.com/s/files/1/0437/6110/7096/files/1324756115.pdf
    • https://cdn.shopify.com/s/files/1/0435/5820/7643/files/duzibedus.pdf
    • https://cdn.shopify.com/s/files/1/0435/2393/2311/files/fallout3_ps3_walkthrough.pdf
    • https://cdn.shopify.com/s/files/1/0437/5317/7237/files/mibisovelo.pdf
    • https://cdn.shopify.com/s/files/1/0438/6842/2309/files/btec_level_3_business_book_2.pdf
    • https://cdn.shopify.com/s/files/1/0434/0000/3749/files/97972730115.pdf
    • https://cdn.shopify.com/s/files/1/0431/1816/6167/files/tugetirebotozujivuguwof.pdf
    • https://cdn.shopify.com/s/files/1/0432/0113/4747/files/49974894309.pdf
    • https://cdn.shopify.com/s/files/1/0432/4048/9122/files/ninazuvogisalimu.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_off00006229.bin
872dfd606fee7a43734076eb4af5e073d89e35d44d5514186bff4c5a87fd6448		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6229 5172 bytes
font_01_sfnt_off000073b2.bin
3698bf75cd40ceedb87c5d550502e0f2fb8749281bec0ff05e7ca40686169aab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73B2 9600 bytes

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