Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1cc41f70193503e…

MALICIOUS

PDF

45.0 KB Created: 2020-08-05 05:32:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 37a9b36b78ee0743b4823b24fef2b568 SHA-1: 53773fa961e6253eb46607bacd8a3506847b258d SHA-256: d1cc41f70193503e416fc20985b24431a2d8ff4eafd7db5c102b5cb533d0b276
152 Risk Score

Malware Insights

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

The PDF was flagged as malicious by a machine learning classifier and contains a critical heuristic indicating it links to known malicious redirector infrastructure. The document body, though partially corrupted, contains text related to 'vocabulary list pdf for bank po exam' and a URL that appears to be part of a link farm. The primary malicious IOC is the redirector URL, which is likely used to funnel victims to a phishing or malware distribution site.

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=vocabulary+list+pdf+for+bank+po+exam
    • http://files.tcfdiopa.org/uploads/1/3/2/6/132682040/bojivitoferi_subegejidijij_xakegevabofepu_kivefodimo.pdf
    • http://files.drexinger.com/uploads/1/3/2/7/132712050/degozusok.pdf
    • http://files.tucsonkestrel.com/uploads/1/3/0/8/130813588/3056085.pdf
    • https://cdn.shopify.com/s/files/1/0430/7235/6513/files/935549433.pdf
    • https://cdn.shopify.com/s/files/1/0431/5276/9192/files/woodland_wa_weather.pdf
    • https://cdn.shopify.com/s/files/1/0428/4294/7751/files/affirmations_1_for_health_wealth_relationships_and_self_expression.pdf
    • https://cdn.shopify.com/s/files/1/0441/4350/9656/files/encoding_and_decoding_huffman_code_in_java.pdf
    • https://cdn.shopify.com/s/files/1/0437/6703/8109/files/16923614683.pdf
    • https://cdn.shopify.com/s/files/1/0431/4375/7992/files/ielts_listening_test_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0434/7520/6294/files/zimoloravileworirag.pdf
    • https://cdn.shopify.com/s/files/1/0428/2207/4534/files/delonghi_espresso_machine_manual.pdf
    • https://cdn.shopify.com/s/files/1/0429/8624/2201/files/53858828803.pdf
    • https://cdn.shopify.com/s/files/1/0433/4298/7422/files/22272256216.pdf
    • https://cdn.shopify.com/s/files/1/0428/8249/8716/files/juzekotigamixuv.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/
    • https://cdn.shopify.com/s/files/1/0431/4375/7992/f

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000063ba.bin
b101c0e7469ba21107983d39d12ae058a54cc61dd37762c5c9a59a66ce43002d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63BA 5524 bytes
font_01_sfnt_off00007660.bin
6543830ba952e0a2676b356c7a233e9089b119131d8519fa418b8bbd6f16c831		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7660 10020 bytes
font_02_sfnt_off00009893.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9893 4324 bytes

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