Malicious PDF — malware analysis report

Static analysis result for SHA-256 c52753c830ad92d8…

MALICIOUS

PDF

40.4 KB Created: 2020-08-26 08:19:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f17244fb7cd04fcfb3baf334e8822e7b SHA-1: 3b2a751a1ff6b7fc313b7fdafb15fcac1f65744d SHA-256: c52753c830ad92d817b6dbedb584d32cebb5e7d61926659cace32305dc7f733f
152 Risk Score

Malware Insights

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

The PDF file was flagged by multiple critical heuristics for containing malicious redirector links and a large number of embedded external PDF links, indicative of an SEO spam farm. The primary malicious URL identified is https://ttraff.club/pify?keyword=alesis+3630+owners+manual, which is likely used to redirect users to further malicious content. 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.club/pify?keyword=alesis+3630+owners+manual
    • http://files.peacefulplacesinc.org/uploads/1/3/1/4/131453990/1283755.pdf
    • http://files.rta-ot.com/uploads/1/3/2/6/132695836/5295392.pdf
    • http://files.lowndescountyarc.org/uploads/1/3/0/8/130874566/fisavivaguj.pdf
    • http://fodexa.perchancetheatre.com/uploads/1/3/1/3/131384600/a803713e2fb1d8.pdf
    • http://files.bernardinthecity.com/uploads/1/3/1/4/131453712/pulasuligufizul.pdf
    • https://cdn.shopify.com/s/files/1/0435/9297/4499/files/kujaxitirifexidutaxuwi.pdf
    • https://cdn.shopify.com/s/files/1/0434/5711/8374/files/bosch_gsb_13_re_manual.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tivaluzisezulumavolo.pdf
    • https://cdn.shopify.com/s/files/1/0435/8828/8670/files/44976693159.pdf
    • https://cdn.shopify.com/s/files/1/0433/9925/0081/files/namezitusojibunufivod.pdf
    • https://cdn.shopify.com/s/files/1/0448/4582/6210/files/xawilow.pdf
    • https://cdn.shopify.com/s/files/1/0431/3792/5269/files/jetegatejuvexov.pdf
    • https://cdn.shopify.com/s/files/1/0460/3281/4239/files/fuxupisepaluzu.pdf
    • https://cdn.shopify.com/s/files/1/0434/4214/3397/files/99954270012.pdf
    • https://cdn.shopify.com/s/files/1/0434/2834/8056/files/dokuniga.pdf
    • https://cdn.shopify.com/s/files/1/0431/6259/9586/files/kotisupubizud.pdf
    • https://cdn.shopify.com/s/files/1/0427/7341/4055/files/wukadidefel.pdf
    • https://cdn.shopify.com/s/files/1/0438/5538/0630/files/make_row_fixed_in_google_sheets.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_off000051c4.bin
f4f86b8f445c5f0c85e3d3f955a5567f22565773cb4638849da2eb3dc9ea06e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x51C4 5172 bytes
font_01_sfnt_off0000633a.bin
b2c9c97fe4013f747890745f97316d2d2af430fb65c2a3c5813ebf32c07d2ee9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x633A 10336 bytes
font_02_sfnt_off00008689.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8689 4324 bytes

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