Malicious PDF — malware analysis report

Static analysis result for SHA-256 a38b48ae12dc9243…

MALICIOUS

PDF

45.7 KB Created: 2020-08-03 20:47:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c523036eceb8026db4c3550d84d3c960 SHA-1: 538b1eb6896691b573ef070f420dd7e632f23a62 SHA-256: a38b48ae12dc9243586637b396018ba380720dc0801251e1379fd30bd403286d
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. The document body, though heavily obfuscated, contains text related to math exercises and the malicious URL, suggesting a lure. The presence of a PDF link farm heuristic further indicates malicious intent to distribute links. The ML classifier strongly flagged this PDF as malicious.

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.com/pify?keyword=additionsverfahren+gleichsetzungsverfahren+einsetzungsverfahren+aufgaben+pdf
    • http://xuputibuz.latrobevalleydodgeball.com/uploads/1/3/1/3/131398222/2721329.pdf
    • http://files.kurtweissgerber.com/uploads/1/3/0/7/130775583/8036038.pdf
    • http://files.pennstatefiji.org/uploads/1/3/1/3/131383650/jaziteme_vedusurefalix_nawegukom.pdf
    • https://cdn.shopify.com/s/files/1/0431/6515/5489/files/fororexedivope.pdf
    • https://cdn.shopify.com/s/files/1/0436/1004/6621/files/custom_mouse_pointers.pdf
    • https://cdn.shopify.com/s/files/1/0428/1755/2543/files/99017626277.pdf
    • https://cdn.shopify.com/s/files/1/0428/8181/0595/files/ropezuniwutiwomolunefoj.pdf
    • https://cdn.shopify.com/s/files/1/0432/0670/5316/files/60143648065.pdf
    • https://cdn.shopify.com/s/files/1/0428/9419/6902/files/31793169520.pdf
    • https://cdn.shopify.com/s/files/1/0432/4494/5571/files/algebra_michael_artin_2nd_edition_download.pdf
    • https://cdn.shopify.com/s/files/1/0435/1619/9066/files/sevilibaxubir.pdf
    • https://cdn.shopify.com/s/files/1/0450/4177/8838/files/one_electron_theory.pdf
    • https://cdn.shopify.com/s/files/1/0429/1274/3580/files/80318188455.pdf
    • https://cdn.shopify.com/s/files/1/0433/5173/6471/files/75530330364.pdf
    • https://cdn.shopify.com/s/files/1/0434/9041/0658/files/kuwimexetabomab.pdf
    • https://cdn.shopify.com/s/files/1/0430/5849/5639/files/54650131473.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_off00005f11.bin
372fb47ff577ab0f9725c07c130202114b33dbef7c18487005e006e9059da1e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F11 5540 bytes
font_01_sfnt_off000071e8.bin
19b7f7ab65b45388369d6239787cf3874aaba5dd7721e26c63663eae8d57409c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71E8 12292 bytes
font_02_sfnt_off000098bf.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x98BF 4324 bytes

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