Malicious PDF — malware analysis report

Static analysis result for SHA-256 323905a1383ed11d…

MALICIOUS

PDF

54.9 KB Created: 2020-08-08 05:57:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0d9e9266ce756a009f94e245abf31f8c SHA-1: e79fba90dd78ff5af2df59f3532195047848973b SHA-256: 323905a1383ed11d89b634a7bfae70f7c946fff4d6c1063af86ed09807f3b560
152 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of a link farm, embedding numerous external links, with one specifically identified as a malicious redirector. The ML classifier strongly indicated maliciousness. The primary attack pattern involves leveraging these links, likely to direct users to malicious websites or to engage in SEO manipulation. No scripts were extracted, limiting the analysis of direct payload execution.

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=helix+antenna+pdf
    • http://files.vegetableway.com/uploads/1/3/1/4/131454373/a5b4e49e141.pdf
    • http://files.morrinsvillecommunityhouse.org/uploads/1/3/1/1/131163635/3aa3e9bb70b98.pdf
    • http://files.phillipaheart.com/uploads/1/3/1/4/131437246/gimikixewe_lodutowom_lutufoxobuwi.pdf
    • https://cdn.shopify.com/s/files/1/0433/6245/1611/files/xunokedomapunigezuxabuw.pdf
    • https://cdn.shopify.com/s/files/1/0441/0392/5912/files/sizuvofawizedugojimoba.pdf
    • https://cdn.shopify.com/s/files/1/0439/0184/5659/files/garmin_forerunner_10_manual.pdf
    • https://cdn.shopify.com/s/files/1/0430/0275/7281/files/rukexup.pdf
    • https://cdn.shopify.com/s/files/1/0427/6230/5702/files/lipukufibategukazunop.pdf
    • https://cdn.shopify.com/s/files/1/0433/0163/4213/files/hashmap_iterator_java.pdf
    • https://cdn.shopify.com/s/files/1/0438/5187/4466/files/nedopan.pdf
    • https://cdn.shopify.com/s/files/1/0430/0311/7719/files/gawelununitosim.pdf
    • https://cdn.shopify.com/s/files/1/0429/0406/0071/files/mandarin_chinese_english_bilingual_visual_dictionary_dk_visual_dictionaries.pdf
    • https://cdn.shopify.com/s/files/1/0437/1320/0282/files/79357310708.pdf
    • https://cdn.shopify.com/s/files/1/0431/2799/6565/files/atharva_veda_mantras_in_telugu.pdf
    • https://cdn.shopify.com/s/files/1/0430/4207/8877/files/14693037709.pdf
    • https://cdn.shopify.com/s/files/1/0431/2127/9132/files/idylis_416710_manual.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_off00007a9c.bin
3e763c908d9a04c4f1a13d7ca9e52afdab882c55fe7b252b168526db9bb31546		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A9C 4792 bytes
font_01_sfnt_off00008b06.bin
84cbb304faf3accdf6742ea98c39bc07ddf25ef6b981f67d5561c9ebef335b46		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B06 14580 bytes
font_02_sfnt_off0000b93f.bin
1eccc54fefb9abd7523536d70b6540ecea6b22523636cdd6817964399ce1b61a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB93F 16188 bytes

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