Malicious PDF — malware analysis report

Static analysis result for SHA-256 21fa7861f4022d59…

MALICIOUS

PDF

33.9 KB Created: 2020-08-20 19:01:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e43e6b075201925f67f04730d5ff574b SHA-1: f01078c523522d0b7163d6615b284e3f8b577aac SHA-256: 21fa7861f4022d59295c4db37733f2158f51d705610d66986c7afadc5489ba91
154 Risk Score

Malware Insights

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

The PDF was flagged by multiple critical heuristics for containing malicious redirector links and a large number of external links, indicating a link farm. The primary malicious URL identified is https://ttraff.cc/pify?keyword=ceramah+ustaz+ebit+lew. The document body contains a mix of seemingly benign text and URLs, further supporting the attack pattern of luring users to external, potentially malicious, content. No scripts were extracted from this sample.

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=ceramah+ustaz+ebit+lew
    • http://files.nostringspuppetworks.com/uploads/1/3/1/3/131383483/pulifajazadevenomu.pdf
    • http://files.learnwithmmg.com/uploads/1/3/1/4/131407704/xudokudutebofe.pdf
    • https://cdn.shopify.com/s/files/1/0434/0721/2709/files/gabriel_s_oboe_flute_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0437/5497/9477/files/50539760182.pdf
    • https://cdn.shopify.com/s/files/1/0430/8549/6469/files/bova_compounding_order_form.pdf
    • https://cdn.shopify.com/s/files/1/0434/0069/1868/files/6937970413.pdf
    • https://cdn.shopify.com/s/files/1/0431/8996/0865/files/22549367237.pdf
    • https://cdn.shopify.com/s/files/1/0440/5913/2069/files/gowifinexufidebebo.pdf
    • https://cdn.shopify.com/s/files/1/0434/8385/7053/files/jesamesozodunineduju.pdf
    • https://cdn.shopify.com/s/files/1/0432/3491/8568/files/59723258255.pdf
    • https://cdn.shopify.com/s/files/1/0432/8649/5396/files/368263473.pdf
    • https://cdn.shopify.com/s/files/1/0428/1974/8006/files/nedufesuvebimazoreri.pdf
    • https://cdn.shopify.com/s/files/1/0434/1117/7629/files/10195411080.pdf
    • https://cdn.shopify.com/s/files/1/0443/6181/0076/files/catecismo_para_primera_comunion.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_off00004787.bin
e08fe77f7423bbc097b625f7720393a795229b1eb1d68ab15909a122e8aa99a8
pdf-font-stream PDF embedded font (sfnt) at offset 0x4787 5112 bytes
font_01_sfnt_off000058d7.bin
04353b9cc71fc46d3722a452bd3689c583c6a841eabb05addd6402db7bd08edd
pdf-font-stream PDF embedded font (sfnt) at offset 0x58D7 10064 bytes