Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbdf19e754f1884d…

MALICIOUS

PDF

51.2 KB Created: 2020-08-08 01:40:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dd5ea0f67574993fda118352bd602582 SHA-1: f5a67074b61f9eb0aea5dbf3d6f2f5123f454e0f SHA-256: bbdf19e754f1884d2a14ad062645fb804a7742f0458fdd07bc9803d77b0101e8
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically `https://ttraff.cc/pify?keyword=sinhala+baby+girl+names+with+meaning+pdf`. The document body, though heavily obfuscated, appears to contain this URL and other embedded URLs, suggesting a lure to external malicious content. The presence of a large number of external PDF links, many hosted on Shopify, further indicates a link farm or SEO poisoning attempt to drive traffic to malicious 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.cc/pify?keyword=sinhala+baby+girl+names+with+meaning+pdf
    • http://files.millerptorlando.com/uploads/1/3/0/8/130874257/redefifiguweve_jelajenor.pdf
    • http://files.marieliterary.com/uploads/1/3/1/4/131483830/wapefisapopekel_resajemerimogik.pdf
    • http://files.highintensitytrack.com/uploads/1/3/1/4/131437932/nuvap.pdf
    • https://cdn.shopify.com/s/files/1/0428/3590/2631/files/letter_of_recommendation_for_student_scholarship.pdf
    • https://cdn.shopify.com/s/files/1/0433/1061/2635/files/21415405729.pdf
    • https://cdn.shopify.com/s/files/1/0436/9635/7530/files/36063395435.pdf
    • https://cdn.shopify.com/s/files/1/0433/4272/5275/files/calendar_worksheets_grade_2.pdf
    • https://cdn.shopify.com/s/files/1/0433/3699/0885/files/3737682934.pdf
    • https://cdn.shopify.com/s/files/1/0431/7069/3284/files/saxidivisebatapimumemu.pdf
    • https://cdn.shopify.com/s/files/1/0432/0067/6001/files/wonidajerovewerewiru.pdf
    • https://cdn.shopify.com/s/files/1/0437/6153/3082/files/66746695088.pdf
    • https://cdn.shopify.com/s/files/1/0427/5719/3895/files/32540190913.pdf
    • https://cdn.shopify.com/s/files/1/0429/4891/9459/files/97969411203.pdf
    • https://cdn.shopify.com/s/files/1/0436/3078/8758/files/biwojabafova.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_off0000625e.bin
74be1e6bd2c68637d100ea246cb24ac9832f7dd0eb84982df9c35f1c0de4f474		 pdf-font-stream PDF embedded font (sfnt) at offset 0x625E 5892 bytes
font_01_sfnt_off00007610.bin
9c90c310970277b277e25d8d39d6fe834e71f533ba229b742882050a0fa39bf3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7610 9028 bytes
font_02_sfnt_off00009219.bin
addc657b4a9edee3102dbb1de5531af81e152ddcaeed60b66fa8b3c12f908c76		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9219 14928 bytes

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