Malicious PDF — malware analysis report

Static analysis result for SHA-256 c85e97f994b4e271…

MALICIOUS

PDF

48.7 KB Created: 2020-08-22 09:41:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cea875384a3a451bb51e9869a0a9d510 SHA-1: e2e8b436af8fdd87b6c2bcdd5c2b978c8b10433f SHA-256: c85e97f994b4e27194a96d9b3a841b9a08944bb3ff14855ad8ce59dc1142ea33
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm hosted on cdn.shopify.com, and one critical link redirects to a known malicious domain (ttraff.cc). The document body, though heavily obfuscated, contains references to popular media and book titles, likely intended to attract user clicks. 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.cc/pify?keyword=yamla+pagla+deewana+new+video+song
    • http://genudek.mnrpcv.org/uploads/1/3/0/7/130776485/7a413da0cf43.pdf
    • http://files.oregonwaterpolo.org/uploads/1/3/0/7/130775551/jegewaxanen_nidibepa_ludomuved_nogikitu.pdf
    • http://files.newelca.org/uploads/1/3/1/1/131164081/9116296.pdf
    • https://cdn.shopify.com/s/files/1/0432/1338/9992/files/hindu_holy_books_free.pdf
    • https://cdn.shopify.com/s/files/1/0433/4754/2175/files/abcd_2_movie_song_free.pdf
    • https://cdn.shopify.com/s/files/1/0432/8855/9782/files/advanced_language_practice_vince.pdf
    • https://cdn.shopify.com/s/files/1/0438/4315/8166/files/lukodal.pdf
    • https://cdn.shopify.com/s/files/1/0429/9977/5381/files/1875031860.pdf
    • https://cdn.shopify.com/s/files/1/0427/8085/2383/files/gajawilixo.pdf
    • https://cdn.shopify.com/s/files/1/0432/3108/4708/files/badevolifugelepofom.pdf
    • https://cdn.shopify.com/s/files/1/0431/2956/9434/files/poziwizuned.pdf
    • https://cdn.shopify.com/s/files/1/0433/4272/5275/files/togodaj.pdf
    • https://cdn.shopify.com/s/files/1/0430/3729/4741/files/bixanikutogeriko.pdf
    • https://cdn.shopify.com/s/files/1/0432/0621/3789/files/21627422578.pdf
    • https://cdn.shopify.com/s/files/1/0438/5341/4565/files/ledubikikeram.pdf
    • https://cdn.shopify.com/s/files/1/0465/0129/8334/files/21115893870.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_off00006941.bin
a1cf2d97d6e17f72c9b5c34171bc04d6f89712c0f34ce1259674d33f8bb6c8f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6941 5296 bytes
font_01_sfnt_off00007b54.bin
f15212227003b870a84147d7a8bca9eefb983a39cdaa203f7dfbe94570e01f2e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B54 10724 bytes
font_02_sfnt_off0000a03e.bin
6e3fbd491d8b71441998836ddca0d0c102716a221ea14f8143929167ad9a79b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA03E 16164 bytes

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