Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a91aa52d7a2d2df…

MALICIOUS

PDF

45.0 KB Created: 2020-08-09 11:02:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c9a0292ddc35e2f907434e80d007309a SHA-1: 7180bc33e6f973339c1b6394d599855c1085b866 SHA-256: 1a91aa52d7a2d2df1c12beb73a7e013ec0b6da8ed0f40b32f20879f7ae0bce5c
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to ttraff.com. The document body, though heavily obfuscated, contains the same URL and references a 'tourist guide pdf', suggesting a lure. The presence of numerous other PDF links, many hosted on Shopify, indicates a link farm designed to obscure the malicious destination. The ML classifier also strongly flagged this PDF as malicious.

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=andhra+pradesh+tourist+guide+pdf
    • http://files.pqassessments.com/uploads/1/3/1/0/131071082/fasanusexipux.pdf
    • http://jinumef.kealohavolleyball.com/uploads/1/3/1/0/131070767/pavolufajute-vudexuwidifuwat.pdf
    • http://files.lisa-rivers.com/uploads/1/3/1/0/131069869/wekok_sugabetokoda_lesipizarafu_xegipewufibe.pdf
    • http://files.bluewrenadventures.com/uploads/1/3/1/4/131438539/gogajozuleger-wotevedajet-topun-dafevuzut.pdf
    • http://files.fatdtogo.com/uploads/1/3/2/6/132681194/farijuberifep.pdf
    • https://cdn.shopify.com/s/files/1/0431/6708/8800/files/japixufodusevinepu.pdf
    • https://cdn.shopify.com/s/files/1/0431/0863/0681/files/cub_scout_tiger_handbook_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/2998/7489/files/bnmu_part_3_result_2020_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/2896/2715/files/42468376093.pdf
    • https://cdn.shopify.com/s/files/1/0434/3876/8294/files/xijaguxizitu.pdf
    • https://cdn.shopify.com/s/files/1/0433/6756/3429/files/28192218526.pdf
    • https://cdn.shopify.com/s/files/1/0430/8366/1461/files/33309334701.pdf
    • https://cdn.shopify.com/s/files/1/0431/8058/9207/files/safe_haven_nicholas_sparks.pdf
    • https://cdn.shopify.com/s/files/1/0437/6556/3549/files/dadulivizosag.pdf
    • https://cdn.shopify.com/s/files/1/0436/6453/9798/files/cuadernillo_para_aprender_a_leer_y_escribir.pdf
    • https://cdn.shopify.com/s/files/1/0437/5393/0901/files/75666977215.pdf
    • https://cdn.shopify.com/s/files/1/0430/0803/2922/files/tujobukarurebiniwotawimo.pdf
    • https://cdn.shopify.com/s/files/1/0429/5193/4108/files/pebopuzezafamijomataj.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_off00007374.bin
e907b19eab4c83025d4e458bac410132cff2cc3bbb3d1346967a5c9677f9a41a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7374 5260 bytes
font_01_sfnt_off0000854f.bin
19c9e35e3fa64ee4d242ff357ef9897a64dd460cfcdbe13db5bd414084128936		 pdf-font-stream PDF embedded font (sfnt) at offset 0x854F 9816 bytes

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