Malicious PDF — malware analysis report

Static analysis result for SHA-256 8511c68b89f28730…

MALICIOUS

PDF

58.8 KB Created: 2020-08-30 09:05:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4fe2f0be72dec4a16a3428874464bf13 SHA-1: bc89b242aa77a86fabef20b443cf881e09587f04 SHA-256: 8511c68b89f28730792d403f83015ccda24b58a3d090c9e2bf59d47f18443461
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to a redirector service known for malicious activity. The document body, though heavily obfuscated, contains references to 'simcity buildit tareas de concurso d' and the malicious URL, suggesting a lure to a contest or task. The presence of a link farm heuristic further supports the attack pattern of directing users to external, potentially malicious, content.

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/wix?keyword=simcity+buildit+tareas+de+concurso+d
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0431/5555/4458/files/laniv.pdf
    • https://cdn.shopify.com/s/files/1/0430/5004/1495/files/rubotijolumuwinebi.pdf
    • https://cdn.shopify.com/s/files/1/0432/8279/2612/files/hampton_bay_ceiling_fan_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/6345/1560/files/autocad_drawing.pdf
    • https://static.usrfiles.com/ugd/f55bec_8dffee07b04445cdafffab9c1aef35b2.pdf
    • https://static.usrfiles.com/ugd/a43ec6_20e4ead2d63d41eb841d98642586563a.pdf
    • https://static.usrfiles.com/ugd/b4609a_e5080551a303461e900326f04c169604.pdf
    • https://static.usrfiles.com/ugd/f3ecbe_960f763878db43ba9da47fb4eba5546e.pdf
    • https://static.usrfiles.com/ugd/b8c837_b207ad7ef46945b7889860c5efc70661.pdf
    • https://cdn.shopify.com/s/files/1/0432/8289/0912/files/how_big_is_an_acre_visual.pdf
    • https://cdn.shopify.com/s/files/1/0427/7554/3964/files/transformers_autobots_names_with_pictures.pdf
    • https://cdn.shopify.com/s/files/1/0429/5039/4019/files/bhojpuri_song_dj_video.pdf
    • https://cdn.shopify.com/s/files/1/0433/2113/1161/files/possessive_pronouns_exercises_primaria.pdf
    • https://cdn.shopify.com/s/files/1/0431/6980/8550/files/bwana_awabariki_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0431/6839/9524/files/760642791.pdf
    • https://cdn.shopify.com/s/files/1/0430/5115/5618/files/mixaladipetuvifu.pdf
    • https://cdn.shopify.com/s/files/1/0430/8759/3632/files/35362889016.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008e0c.bin
4751c66858ebe39a716fa11ee3b9ff0e615d537346db450372df50287fb4de67		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8E0C 5312 bytes
font_01_sfnt_off00009ff2.bin
49506b4c01bea269b8d20f2c8ecc3a976038869559d39cde052f68edbb649fdc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9FF2 15128 bytes
font_02_sfnt_off0000ce71.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCE71 4324 bytes

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