Malicious PDF — malware analysis report

Static analysis result for SHA-256 df3c92889dee36f2…

MALICIOUS

PDF

51.1 KB Created: 2020-09-02 20:47:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 20b5e0751120aa272cbfedfdbbed5373 SHA-1: 99ffcfac9fe635ae43688bf4f5d494fc79d9edfc SHA-256: df3c92889dee36f2207339a0b06ce699f4c737339f56b47998dfe98e548e33b4
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, pointing to 'https://ttraff.me/pify?keyword=new+bollywood+movies++free+2018'. This URL is presented within the document body, disguised as a free movie download lure. The PDF also contains a link farm heuristic, with numerous links hosted on cdn.shopify.com, suggesting an attempt to obscure the malicious redirector or distribute content. The ML classifier strongly flagged this PDF as malicious.

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.me/pify?keyword=new+bollywood+movies++free+2018
    • https://cdn.shopify.com/s/files/1/0433/4885/2891/files/4663136621.pdf
    • https://cdn.shopify.com/s/files/1/0432/1394/7041/files/25337334369.pdf
    • https://cdn.shopify.com/s/files/1/0463/5954/3969/files/53405299015.pdf
    • https://cdn.shopify.com/s/files/1/0429/6340/2905/files/levels_of_government_worksheet_answers.pdf
    • https://cdn.shopify.com/s/files/1/0440/2577/4245/files/48177003524.pdf
    • https://cdn.shopify.com/s/files/1/0432/3203/4976/files/hwy_99_traffic_report.pdf
    • https://cdn.shopify.com/s/files/1/0434/6930/8061/files/les_4_accords_toltques_gratuit.pdf
    • https://cdn.shopify.com/s/files/1/0437/5255/4657/files/83085006550.pdf
    • https://cdn.shopify.com/s/files/1/0430/8579/1393/files/9114462886.pdf
    • https://cdn.shopify.com/s/files/1/0433/4957/3784/files/wababaxebizidavikujikegi.pdf
    • https://cdn.shopify.com/s/files/1/0437/1306/9205/files/idaho_secretary_of_state_llc_annual_report.pdf
    • https://cdn.shopify.com/s/files/1/0435/2809/3850/files/rodeo_song_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0457/7588/0348/files/zeruwonuzojef.pdf
    • https://cdn.shopify.com/s/files/1/0434/8801/8594/files/17444664810.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_off00008875.bin
5210abc3b77ea41a1099e7375c902edfccabd83cfa27fae0abaa68e4b39d5ad1
pdf-font-stream PDF embedded font (sfnt) at offset 0x8875 5728 bytes
font_01_sfnt_off00009c04.bin
7a3fb3288d9a1c607659dfd7caf36d9987a0c3a1b7f1cec8c01a50f8aaa5c360
pdf-font-stream PDF embedded font (sfnt) at offset 0x9C04 10420 bytes