Malicious PDF — malware analysis report

Static analysis result for SHA-256 56f4ae47502982cd…

MALICIOUS

PDF

44.9 KB Created: 2020-08-03 22:11:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d42650f494c57f1cf1eeec573da54dfd SHA-1: 31a4607918ffa5862edddfc1a3210bd0ab8f0968 SHA-256: 56f4ae47502982cd7b90b2a1acb3ea20cb6934a185c576453c55cf10cb84179b
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 `https://ttraff.cc/pify?keyword=amelia+bedelia+pdf+download`. Additionally, it exhibits a PDF link farm heuristic, indicating a large number of external links, with `https://cdn.shopify.com/s/files/1/0430/2834/9079/files/jugezarajupudeke.pdf` being one of the first identified. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains references to these URLs, suggesting a social engineering lure to trick users into clicking the malicious link.

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=amelia+bedelia+pdf+download
    • http://files.kalituregundogs.com/uploads/1/3/1/3/131381112/ea2e1021073.pdf
    • http://files.anncartermedium.com/uploads/1/3/0/8/130874104/4252089.pdf
    • http://files.mastinsiteservices.com/uploads/1/3/0/8/130813614/7799244.pdf
    • http://files.akuwashairaffair.com/uploads/1/3/1/3/131381046/sotem-ratijo-dorokizem-lelatib.pdf
    • http://files.massageandskintherapybykaren.com/uploads/1/3/1/8/131856034/48124b.pdf
    • https://cdn.shopify.com/s/files/1/0430/2834/9079/files/jugezarajupudeke.pdf
    • https://cdn.shopify.com/s/files/1/0437/2499/6773/files/53975436763.pdf
    • https://cdn.shopify.com/s/files/1/0431/5417/8216/files/fuzunogadaxuxoxaxinikaxar.pdf
    • https://cdn.shopify.com/s/files/1/0429/9299/2410/files/music_theory_for_computer_musicians_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/9390/0958/files/41788750353.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/91960476686.pdf
    • https://cdn.shopify.com/s/files/1/0437/8643/6759/files/49311117340.pdf
    • https://cdn.shopify.com/s/files/1/0433/3872/7589/files/40833936961.pdf
    • https://cdn.shopify.com/s/files/1/0432/9422/8630/files/apsale_net_click_115667_9571_art.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/13164506765.pdf
    • https://cdn.shopify.com/s/files/1/0438/6498/1664/files/molufufowuwiderukif.pdf
    • https://cdn.shopify.com/s/files/1/0428/3075/8054/files/19140125140.pdf
    • https://cdn.shopify.com/s/files/1/0431/7596/8928/files/24288080705.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_off000063d3.bin
8c258117501357ae6d284bfa4fe92efe3a5a3a6c9e148817242ff48de67fc6a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63D3 5136 bytes
font_01_sfnt_off0000754a.bin
a3e41d05061303b563af1c7e3f6342663fd5f2543d6658705b1652c9ba3c7251		 pdf-font-stream PDF embedded font (sfnt) at offset 0x754A 15288 bytes

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