Malicious PDF — malware analysis report

Static analysis result for SHA-256 5277304c2ff2c1f4…

MALICIOUS

PDF

32.0 KB Created: 2020-08-24 10:01:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c8828ddb6a5a81850ed75220d477a80a SHA-1: 3b5c312d2ca5addb59ed9073ee5b0e2efa6dd685 SHA-256: 5277304c2ff2c1f4f459444e9dde2007aee15fd79169b7d04a66471a14473936
152 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by an ML classifier and contains a significant number of embedded links. One critical heuristic identified a link to known malicious redirector infrastructure, specifically 'https://ttraff.cc/pify?keyword=annavaram+cinema+naa+songs'. Another heuristic indicated a PDF link farm with numerous external links, many hosted on Shopify. The document body contains garbled text but also includes the malicious redirector URL and several Shopify-hosted PDF links, suggesting a lure or content hosting mechanism.

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=annavaram+cinema+naa+songs
    • http://files.profeditenglishservices.com/uploads/1/3/0/7/130775817/danenet.pdf
    • http://files.headhuntersltd.co.uk/uploads/1/3/1/0/131070116/9415496.pdf
    • https://cdn.shopify.com/s/files/1/0436/1604/3168/files/5505402887.pdf
    • https://cdn.shopify.com/s/files/1/0428/0313/4627/files/grade_5_math_worksheets_philippines.pdf
    • https://cdn.shopify.com/s/files/1/0438/6082/0133/files/20713966887.pdf
    • https://cdn.shopify.com/s/files/1/0447/9080/8737/files/download_australian_passport_renewal_form.pdf
    • https://cdn.shopify.com/s/files/1/0431/3723/7146/files/vemivarixadifenob.pdf
    • https://cdn.shopify.com/s/files/1/0433/8096/5534/files/76502274769.pdf
    • https://cdn.shopify.com/s/files/1/0432/2839/7728/files/64249848072.pdf
    • https://cdn.shopify.com/s/files/1/0459/2192/7319/files/bahubali_2_songs_free_doregama.pdf
    • https://cdn.shopify.com/s/files/1/0431/0056/9751/files/best_d_d_5e_character_sheet_app.pdf
    • https://cdn.shopify.com/s/files/1/0431/6453/2900/files/pdf_to_word_file_converter_online_free_download.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_off000041ad.bin
6bd196871f6c2bbe50f304b479b3301622c017aac399f6e83c019f98bf226b1e
pdf-font-stream PDF embedded font (sfnt) at offset 0x41AD 5136 bytes
font_01_sfnt_off0000530d.bin
98986e3100bb310566c19864fb5e959ca8549ed36c9917aa7a376a110f7b4541
pdf-font-stream PDF embedded font (sfnt) at offset 0x530D 9560 bytes