Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e2c911528f5a46e…

MALICIOUS

PDF

44.5 KB Created: 2020-08-22 23:00:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3634e02eaf70881dab1fbee71853cf81 SHA-1: 3d84e19f7131530d1706530bf360169c845267e7 SHA-256: 8e2c911528f5a46e020203cea4e34aaa64124e4afc50231bb6d42cd7363b73b3
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically identified as a malicious redirector. The document body, though heavily obfuscated, contains text that appears to be a lure for a game download, directing the user to the malicious URL. The presence of a large number of external PDF links suggests a link farm or SEO poisoning attempt to distribute the malicious content.

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=bubble+struggle+3++pc
    • http://files.sheilabalzer.com/uploads/1/3/2/7/132710575/kososameregiwi.pdf
    • https://cdn.shopify.com/s/files/1/0428/2223/8374/files/10492272009.pdf
    • https://cdn.shopify.com/s/files/1/0435/3071/5288/files/17623709272.pdf
    • https://cdn.shopify.com/s/files/1/0427/6905/5911/files/73558917406.pdf
    • https://cdn.shopify.com/s/files/1/0437/3577/7445/files/65702199862.pdf
    • https://cdn.shopify.com/s/files/1/0435/9097/5647/files/arduino_uno_programming_for_beginners.pdf
    • https://cdn.shopify.com/s/files/1/0430/0485/4426/files/12728838453.pdf
    • https://cdn.shopify.com/s/files/1/0432/9350/7737/files/concentric_zone_theory_by_burgess.pdf
    • https://cdn.shopify.com/s/files/1/0430/4420/8797/files/video_compressor_app_for_pc.pdf
    • https://cdn.shopify.com/s/files/1/0430/0174/1463/files/54947876609.pdf
    • https://cdn.shopify.com/s/files/1/0429/8378/4601/files/getulodemedutibovoxata.pdf
    • https://cdn.shopify.com/s/files/1/0430/2857/8467/files/feminist_critical_discourse_analysis.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_off00006344.bin
3227150d104969c8ea1db67c351a61e1c6621324fa8f3a0f0bc83f209c8d70e8
pdf-font-stream PDF embedded font (sfnt) at offset 0x6344 4864 bytes
font_01_sfnt_off000073e8.bin
52167f27e65135051ac12fafc881b884c9a226874722c1a431cae869be4db2f9
pdf-font-stream PDF embedded font (sfnt) at offset 0x73E8 10452 bytes
font_02_sfnt_off0000976d.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176
pdf-font-stream PDF embedded font (sfnt) at offset 0x976D 4324 bytes