Malicious PDF — malware analysis report

Static analysis result for SHA-256 55938bc2687519d9…

MALICIOUS

PDF

50.7 KB Created: 2020-08-14 13:47:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1c0c4f9bbd2bd6912548ae48bc72fc5f SHA-1: 16f407529f7a5c4096ce8daafe646caf7b06f5e3 SHA-256: 55938bc2687519d940a0b6c394a2dc320e8410bbcf7a14a03a50558029b58e1c
152 Risk Score

Malware Insights

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

The PDF was flagged by multiple critical heuristics indicating malicious redirector links and a link farm. The primary malicious URL, https://ttraff.ru/pify?keyword=amman+1995+tamil+movie+hd, is a known redirector. The document body contains numerous embedded URLs, many pointing to Shopify, but the presence of the malicious redirector and the link farm structure strongly suggests an attempt to lure users to malicious content. No scripts were extracted, limiting the analysis of direct payload delivery mechanisms.

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.ru/pify?keyword=amman+1995+tamil+movie+hd
    • http://files.kojimagenesxsf.com/uploads/1/3/1/0/131070911/rolaxedikovis.pdf
    • http://venijuxuw.mrsoslibrary.com/uploads/1/3/0/7/130739590/pibabinino.pdf
    • http://files.litchfieldrealestateauctionsllc.com/uploads/1/3/1/4/131454549/mukodawula.pdf
    • https://cdn.shopify.com/s/files/1/0432/2004/1886/files/36796225695.pdf
    • https://cdn.shopify.com/s/files/1/0431/8960/0414/files/what_is_nativelog._txt.pdf
    • https://cdn.shopify.com/s/files/1/0431/5712/7336/files/61454847538.pdf
    • https://cdn.shopify.com/s/files/1/0429/5471/9395/files/anatomy_and_physiology_study_notes.pdf
    • https://cdn.shopify.com/s/files/1/0428/2282/8198/files/java_programming_questions_and_answers_for_written_test.pdf
    • https://cdn.shopify.com/s/files/1/0428/9468/8412/files/renaledotejurip.pdf
    • https://cdn.shopify.com/s/files/1/0431/9110/7742/files/pdf_splitter_to_jpg.pdf
    • https://cdn.shopify.com/s/files/1/0447/3955/9578/files/ridiwirefojomenabovisujet.pdf
    • https://cdn.shopify.com/s/files/1/0432/1263/6322/files/coldwell_banker_logo.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_off000071c4.bin
c4c77de79185a6e32b969612b4158c72aca0a6965e648bc7cf893bc7a336abbf
pdf-font-stream PDF embedded font (sfnt) at offset 0x71C4 2900 bytes
font_01_sfnt_off00007c1e.bin
262705fe59c3c78de7e32f2352f1107f814c3957762217954b51b79172760f97
pdf-font-stream PDF embedded font (sfnt) at offset 0x7C1E 5172 bytes
font_02_sfnt_off00008d97.bin
66f5fbd4dd898c1c586b048cf76c11f93a746c070998de4420524815ed2ef457
pdf-font-stream PDF embedded font (sfnt) at offset 0x8D97 15604 bytes