Malicious PDF — malware analysis report

Static analysis result for SHA-256 d922bdb43c4275fa…

MALICIOUS

PDF

43.6 KB Created: 2020-08-12 15:17:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ce2d5e93a8f0fad2b4f4dd9d45376c34 SHA-1: 696917f649ab82fa7bdf46f6f91eaa961f6a6f20 SHA-256: d922bdb43c4275fad0fee61f1eabf3e7ef55f1adb67d52267357c8018807aec3
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, including one identified as a malicious redirector. The document body, though heavily obfuscated, contains text related to 'automobile engineering pdf book download' and the malicious URL, suggesting a lure to download potentially harmful content. The presence of a malicious redirector and a large number of external links indicates a campaign to drive traffic to malicious infrastructure.

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.ru/pify?keyword=automobile+engineering+pdf+book+download
    • http://files.lvr-nj.com/uploads/1/3/0/8/130874567/6741229.pdf
    • http://wadixi.premierpoolnaples.com/uploads/1/3/1/4/131453177/pidudafuz-nasiji-gijus-laxuzu.pdf
    • http://files.guidetoamericasparks.com/uploads/1/3/2/7/132740756/3ee0d.pdf
    • http://jebepum.pohchocolate.com/uploads/1/3/2/3/132303382/dudaxaruwujap_bapenokob_maxonuker.pdf
    • https://cdn.shopify.com/s/files/1/0438/3821/0205/files/9120971872.pdf
    • https://cdn.shopify.com/s/files/1/0430/0580/4698/files/relet.pdf
    • https://cdn.shopify.com/s/files/1/0432/9055/8620/files/4351699261.pdf
    • https://cdn.shopify.com/s/files/1/0428/6559/0438/files/xowomano.pdf
    • https://cdn.shopify.com/s/files/1/0433/0009/4112/files/94043015041.pdf
    • https://cdn.shopify.com/s/files/1/0428/2171/4079/files/fenelifiwefizaxefo.pdf
    • https://cdn.shopify.com/s/files/1/0427/9474/6023/files/how_many_seasons_of_adventure_time.pdf
    • https://cdn.shopify.com/s/files/1/0430/3034/7938/files/wapitiz.pdf
    • https://cdn.shopify.com/s/files/1/0434/5302/2369/files/show_hidden_folders_mac.pdf
    • https://cdn.shopify.com/s/files/1/0428/3337/9487/files/dovibebakiwoviwawewuv.pdf
    • https://cdn.shopify.com/s/files/1/0429/2175/4787/files/27948795237.pdf
    • https://cdn.shopify.com/s/files/1/0432/0306/8068/files/sikorowunavig.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_off0000570e.bin
0ae357475c844557828c0ee1ee14b944d7b4d62e4bae4e5085f384a680dfc812		 pdf-font-stream PDF embedded font (sfnt) at offset 0x570E 5468 bytes
font_01_sfnt_off0000699b.bin
2d35fe1b112251630f6c3e185fb4bf58c6327cea99f60afab3ca0473214b5b30		 pdf-font-stream PDF embedded font (sfnt) at offset 0x699B 2116 bytes
font_02_sfnt_off00007367.bin
ca54a3f0ca7428940568f521b63a69bc0ade91402e879f478fc622937f93eaaa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7367 13964 bytes

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