Malicious PDF — malware analysis report

Static analysis result for SHA-256 514b1e2841fa60ac…

MALICIOUS

PDF

61.8 KB Created: 2020-08-03 17:14:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dd852cf0b4bfdcfe1ba4373032cb7d85 SHA-1: b3328adef51e0ad06ed06df7e95525cce858b288 SHA-256: 514b1e2841fa60acda1cf806d8105f9018cdccbf6b2ef35faf20648de1fd4c8f
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF file contains multiple embedded URLs, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The document body, though partially obfuscated, includes the URL 'https://ttraff.ru/pify?keyword=employment+news+pdf+august+2020', suggesting a lure related to employment news. The presence of numerous other PDF links, as indicated by the 'PDF_SEO_LINK_FARM' heuristic, further supports the malicious intent of directing users to external, potentially harmful, content. No scripts were extracted from this sample.

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=employment+news+pdf+august+2020
    • http://files.broncohack.net/uploads/1/3/1/3/131398242/vodaliva_zodozatonikos.pdf
    • http://files.depictformat.com/uploads/1/3/2/6/132695445/jidugo-rodemepepewejol-bamodejak-zilofol.pdf
    • http://files.socorroboutique.com/uploads/1/3/1/0/131071167/6dbb85b0c583.pdf
    • https://cdn.shopify.com/s/files/1/0430/8788/8535/files/42330717508.pdf
    • https://cdn.shopify.com/s/files/1/0428/8797/0975/files/george_michael_discography.pdf
    • https://cdn.shopify.com/s/files/1/0434/2985/5393/files/nazugagikad.pdf
    • https://cdn.shopify.com/s/files/1/0438/3621/1362/files/can_you_play_games_on_ipod_nano.pdf
    • https://cdn.shopify.com/s/files/1/0431/0096/2967/files/mcquarrie_statistical_mechanics.pdf
    • https://cdn.shopify.com/s/files/1/0432/5697/1432/files/68680495879.pdf
    • https://cdn.shopify.com/s/files/1/0431/0892/5600/files/porubusiditi.pdf
    • https://cdn.shopify.com/s/files/1/0430/2913/5521/files/81050766849.pdf
    • https://cdn.shopify.com/s/files/1/0430/7383/1072/files/wuvufefe.pdf
    • https://cdn.shopify.com/s/files/1/0433/6533/5208/files/relevotaj.pdf
    • https://cdn.shopify.com/s/files/1/0433/6097/7048/files/bimusen.pdf
    • https://cdn.shopify.com/s/files/1/0427/7328/2983/files/5138114299.pdf
    • https://cdn.shopify.com/s/files/1/0428/1607/7991/files/21433068341.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 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006c10.bin
86360d0e2c9d004ca7da41f5dca957fdb0a9f9f2ae78c2fa23be4fcc5b926f14		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C10 5524 bytes
font_01_sfnt_off00007ee2.bin
b91f3c26f37c28538ed09035cbea6f9221827f1e30b50c452f08cc820bcc167b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7EE2 3720 bytes
font_02_sfnt_off00008a45.bin
96cdca237773eac7e256ba7422675b5b0331ac47e97048c10aa802b5539e2923		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A45 10060 bytes
font_03_sfnt_off0000acef.bin
9af6fc3bf9d751f70540aea0fa47faa159a3604992cda23d2adcda3ffc5346b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xACEF 16092 bytes
font_04_sfnt_off0000c1b6.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC1B6 4324 bytes
font_05_sfnt_off0000cfb6.bin
8ee7d42d8f15e066d9c7bc96876a9e76e198b93414f542b3d1098041323b2762		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCFB6 7480 bytes

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