Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa35131d9c1757bd…

MALICIOUS

PDF

55.0 KB Created: 2020-08-29 03:28:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 31b5c3de693ab53fcc584a275a8e0125 SHA-1: e934779398971676d69507a54bedb3bdfd762be2 SHA-256: fa35131d9c1757bd5f25eda4ab54d844aa7a0ee244112e0297aa690f8840b3db
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. This URL is presented in a way that suggests a torrent download, a common lure. The PDF also exhibits characteristics of a link farm, with numerous embedded URLs, many of which point to 'static.usrfiles.com'. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted, but the presence of a malicious redirector URL is sufficient evidence of malicious intent.

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/wix?keyword=meet+the+fokkers+torrent
    • https://static.usrfiles.com/ugd/b8c837_1e138940fa5a4d36bc393f9bad6b77b6.pdf
    • https://static.usrfiles.com/ugd/b8c837_72ac00d833ba4b14b2a37e71ec36f944.pdf
    • https://static.usrfiles.com/ugd/b8c837_d3789925a5934ba8865f20a61d036adb.pdf
    • https://static.usrfiles.com/ugd/b8c837_c932da8cbfff4b2c87b6b42a055f64cd.pdf
    • https://static.usrfiles.com/ugd/b8c837_2cbfb3842dee4ae882683dbbfaced294.pdf
    • https://static.usrfiles.com/ugd/b8c837_cd1ce91826c9476d95f0a45d7b407795.pdf
    • https://static.usrfiles.com/ugd/b8c837_c6574de862bd4d0eb82da68d5e67e820.pdf
    • https://static.usrfiles.com/ugd/b8c837_e2f9d3322edc4e20980356a1bc218064.pdf
    • https://static.usrfiles.com/ugd/b8c837_b98bb2402670435e9064fa46bdc5ad28.pdf
    • https://cdn.shopify.com/s/files/1/0433/8899/3703/files/whatsapp_free_apk_for_jio_phone.pdf
    • https://cdn.shopify.com/s/files/1/0435/8311/1323/files/levawi.pdf
    • https://cdn.shopify.com/s/files/1/0429/1241/5911/files/58778017936.pdf
    • https://cdn.shopify.com/s/files/1/0429/1559/4393/files/18340168800.pdf
    • https://cdn.shopify.com/s/files/1/0428/4288/2215/files/44919613503.pdf
    • https://cdn.shopify.com/s/files/1/0430/4669/9165/files/24587364956.pdf
    • https://cdn.shopify.com/s/files/1/0431/5430/9284/files/taparugidobaxegajokijuw.pdf
    • https://cdn.shopify.com/s/files/1/0429/8512/8099/files/30877796250.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_off0000999e.bin
7a31fa38b32c6529f2d56ffebadf2749b593e4274ad302fbe25c3753e335896a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x999E 4680 bytes
font_01_sfnt_off0000a993.bin
80621df2230e5ab4e5f8ae2f84bf4abf9ae5dd99f889ef3f26ac81f9f39ea988		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA993 10840 bytes

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