Malicious PDF — malware analysis report

Static analysis result for SHA-256 430c555c409427f8…

MALICIOUS

PDF

42.9 KB Created: 2020-08-05 04:37:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 17235fd2c3610f10a02db7c3a1daaa37 SHA-1: 483aca270fd14163c3f0426565fc5be1f832b12c SHA-256: 430c555c409427f803cb29e605f3ff469a2bd12285b135fa374156d4c165df0b
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body appears to be obfuscated or corrupted, but the presence of numerous links suggests a link farm or phishing lure. The primary malicious IOC is the redirector URL, which likely leads to further 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.cc/pify?keyword=adrenalina+y+noradrenalina+pdf
    • http://files.avianexotichospital.com/uploads/1/3/1/3/131379496/xuronafud_safez_madovanirarubev.pdf
    • http://files.tarahanish.com/uploads/1/3/0/7/130775795/vasikajid_ramobopo_nogotixevu_widaxugezepenik.pdf
    • http://mavavu.shantiyogaashram.com/uploads/1/3/0/7/130776791/1595466.pdf
    • http://files.comoxmobilemassage.ca/uploads/1/3/2/8/132814166/d04ec729cea78.pdf
    • http://files.annaelizabethevents.com/uploads/1/3/1/3/131378932/4020282.pdf
    • https://cdn.shopify.com/s/files/1/0430/0531/3177/files/xojudapimajebenonuvimob.pdf
    • https://cdn.shopify.com/s/files/1/0429/2601/4620/files/57465288656.pdf
    • https://cdn.shopify.com/s/files/1/0435/3464/7445/files/data_structures_and_algorithms_cheat_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0427/8861/8396/files/xogosufaropegugasorukasib.pdf
    • https://cdn.shopify.com/s/files/1/0434/1052/2277/files/zaxapez.pdf
    • https://cdn.shopify.com/s/files/1/0427/6820/3942/files/fubazukoxokoso.pdf
    • https://cdn.shopify.com/s/files/1/0429/6255/0940/files/ensayo_de_las_reformas_borbonicas.pdf
    • https://cdn.shopify.com/s/files/1/0435/4179/0871/files/connectors_in_english_grammar_exercises_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0429/6078/1465/files/33097968952.pdf
    • https://cdn.shopify.com/s/files/1/0430/2218/8701/files/jab_comix_download.pdf
    • https://cdn.shopify.com/s/files/1/0441/3338/4344/files/apj_abdul_kalam_quotes_in_telugu_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/86556218032.pdf
    • https://cdn.shopify.com/s/files/1/0437/5016/2583/files/lujexidowonuduzidugozew.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006a08.bin
864a3d7bdfc1ce36bc61d06c474e4758da4e4c6807452becac092923f1cb8824		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A08 4948 bytes
font_01_sfnt_off00007af7.bin
c30f950389d0b9f3437962cee0d2101edbf4cee3efc94eef6e49c52adda1ea6c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7AF7 10540 bytes

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