Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d47b445db97adc0…

MALICIOUS

PDF

58.2 KB Created: 2020-08-01 10:49:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 24e15906a166b8a31c30faaf19260d65 SHA-1: 2fbca62f81404f47cb20d23b31dce04803ec1cbe SHA-256: 5d47b445db97adc03ae985e6da556ae10bae54535ec98b7b6c4aa41da2ecd498
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many of which point to a redirector service. The document body, though heavily obfuscated, contains a URL that appears to be a lure for a game guide, likely to entice users to click on the malicious links. The ML classifier strongly indicates maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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=escape+from+tarkov+guide
    • http://files.tacomasoutsidersguide.com/uploads/1/3/0/8/130814058/f807844a81d.pdf
    • http://files.nikesitesummit.net/uploads/1/3/1/1/131163872/9463773.pdf
    • http://files.integrityworks.info/uploads/1/3/2/6/132695586/tasaxagozivekunavuxa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/7679/7081/files/17572942042.pdf
    • https://cdn.shopify.com/s/files/1/0434/9696/4261/files/82927827507.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/59022585862.pdf
    • https://cdn.shopify.com/s/files/1/0430/9942/2871/files/sigusuxelejifijuvegefu.pdf
    • https://cdn.shopify.com/s/files/1/0437/5887/8872/files/22685178871.pdf
    • https://cdn.shopify.com/s/files/1/0428/0591/9903/files/53125499324.pdf
    • https://cdn.shopify.com/s/files/1/0433/7149/5574/files/16418562381.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/wetitoditasenubekuxon.pdf
    • https://cdn.shopify.com/s/files/1/0430/5059/8562/files/76501724048.pdf
    • https://cdn.shopify.com/s/files/1/0434/8697/0018/files/54697941818.pdf
    • https://cdn.shopify.com/s/files/1/0433/7546/0515/files/78967933448.pdf
    • https://cdn.shopify.com/s/files/1/0433/5943/6951/files/34657882989.pdf
    • https://cdn.shopify.com/s/files/1/0434/5495/5672/files/41250786893.pdf
    • https://cdn.shopify.com/s/files/1/0433/1008/8357/files/29385960198.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/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009001.bin
2397409df22910dee637120e6a14cced808cf0c584809464b3348c7476c436ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9001 5524 bytes
font_01_sfnt_off0000a2ce.bin
76b3e42f8edd845c180030a27a3471c5a4cdedd7b76005c5cb84ca6bb0a74e03		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA2CE 10532 bytes
font_02_sfnt_off0000c6d6.bin
ae7f93972994935718ba4ca09ad89dad7d5debdcce6018e7b29f2394b45d7aae		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC6D6 16144 bytes

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