Malicious PDF — malware analysis report

Static analysis result for SHA-256 372536e143145ef0…

MALICIOUS

PDF

38.5 KB Created: 2020-09-01 01:53:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d06da1fd0eeebddadc5a18a37d38a6c5 SHA-1: ec71a5d62459521949ec7f47f24487e124f8f83a SHA-256: 372536e143145ef036174aa68bf692a47277788019b9562354bf6360ba3a48b9
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text related to movie downloads and the malicious URL, suggesting a lure to trick users into visiting the redirector. The ML classifier also strongly indicated maliciousness.

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.com/pify?keyword=tamilrockers+2018+movies++telugu+free
    • https://cdn.shopify.com/s/files/1/0430/7209/4362/files/hd_screen_size.pdf
    • https://cdn.shopify.com/s/files/1/0436/3298/4222/files/endnote_x8_product_key_free.pdf
    • https://cdn.shopify.com/s/files/1/0429/6110/9155/files/68192364027.pdf
    • https://cdn.shopify.com/s/files/1/0438/1694/3778/files/78254516156.pdf
    • https://cdn.shopify.com/s/files/1/0437/2499/6758/files/fubaxoxexodid.pdf
    • https://cdn.shopify.com/s/files/1/0433/1739/5611/files/bach_air_on_g_string_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0428/0687/0183/files/24912418405.pdf
    • https://cdn.shopify.com/s/files/1/0434/2031/9893/files/51265290030.pdf
    • https://cdn.shopify.com/s/files/1/0431/6148/5471/files/93775959606.pdf
    • https://cdn.shopify.com/s/files/1/0431/7567/4014/files/93988440145.pdf
    • https://static.usrfiles.com/ugd/ca300b_066206880bef47048b436fbdfd711c24.pdf
    • https://static.usrfiles.com/ugd/286fb8_b4658d1dc92644adb595908f02dc4f68.pdf
    • https://static.usrfiles.com/ugd/b65acf_137109532dab4a7f861b95667e12f86a.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_off0000507a.bin
3895fadb914032505da87f953ae23727ac06d161565425b54b9dc75e5d6ce80b
pdf-font-stream PDF embedded font (sfnt) at offset 0x507A 5796 bytes
font_01_sfnt_off0000642e.bin
0ccde2070deea7be133524d60a3e11cbe47d8740a64071d393987484244daad8
pdf-font-stream PDF embedded font (sfnt) at offset 0x642E 12932 bytes