Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8762183601f9bba…

MALICIOUS

PDF

40.7 KB Created: 2020-08-25 15:41:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fa45749fc84dc5e33d5157a467b5f98e SHA-1: 8563bfa09019ff51d8280df281a123a9a94e686e SHA-256: f8762183601f9bbae71c93e0f83a35d2d5e6e6bc8d9e9323df789dc603658b67
152 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier as malicious and contains numerous embedded URLs. One URL points to a known malicious redirector, while others are part of a link farm. The document body contains garbled text but includes the URL 'https://ttraff.com/pify?keyword=axiology+in+research+pdf', which is associated with malicious redirector infrastructure. The presence of a large number of external links suggests an attempt to drive traffic to potentially harmful sites.

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=axiology+in+research+pdf
    • http://jogizir.solsticedevelopment.com/uploads/1/3/1/6/131606490/5110226.pdf
    • http://files.allsaintsparkslope.org/uploads/1/3/2/7/132712447/3888168.pdf
    • http://files.1ofafindonline.com/uploads/1/3/1/0/131070469/2435cd70bed.pdf
    • https://cdn.shopify.com/s/files/1/0435/1174/2628/files/macos_sierra_download_app_store.pdf
    • https://cdn.shopify.com/s/files/1/0430/5531/7149/files/25514595364.pdf
    • https://cdn.shopify.com/s/files/1/0440/2459/4597/files/pojelojasipifitat.pdf
    • https://cdn.shopify.com/s/files/1/0435/4303/6053/files/vusanorimorol.pdf
    • https://cdn.shopify.com/s/files/1/0432/0509/9675/files/chicken_casserole_healthy_food_guide.pdf
    • https://cdn.shopify.com/s/files/1/0430/5141/7751/files/20867052295.pdf
    • https://cdn.shopify.com/s/files/1/0430/6662/2106/files/45089103800.pdf
    • https://cdn.shopify.com/s/files/1/0432/6568/7717/files/395492628.pdf
    • https://cdn.shopify.com/s/files/1/0431/7410/1160/files/16565186613.pdf
    • https://cdn.shopify.com/s/files/1/0428/3269/1363/files/60712579117.pdf
    • https://cdn.shopify.com/s/files/1/0430/0288/8351/files/grade_4_math_practice_book.pdf
    • https://cdn.shopify.com/s/files/1/0431/8298/1281/files/84449288850.pdf
    • https://cdn.shopify.com/s/files/1/0437/3915/2535/files/58320158932.pdf
    • https://cdn.shopify.com/s/files/1/0435/5378/3957/files/76318100923.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_off0000600d.bin
b2a38d6da01bd3b8c608e196de3f04f8f9044de72038b0c1ecbbb5c21b69f226		 pdf-font-stream PDF embedded font (sfnt) at offset 0x600D 5576 bytes
font_01_sfnt_off000072fe.bin
a14b57021d4a5611160c6cbf12a8d5b28a63cb0679ff0c2983339d70135b3d2b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72FE 10288 bytes

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