Malicious PDF — malware analysis report

Static analysis result for SHA-256 a97c58c4322c1d5b…

MALICIOUS

PDF

40.5 KB Created: 2020-08-09 02:48:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1cd0be81b691cf806421123379f9b594 SHA-1: 34c28f67d2529b74462abb29a631ba25e69de46b SHA-256: a97c58c4322c1d5bb9ccee6cb274dfa6834fb81197e0e44a6dac6a2c047ea8b6
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external resources. One critical heuristic firing indicates that the PDF links to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the URL 'https://ttraff.cc/pify?keyword=chemistry+notes+for+class+9+in+urdu+pdf', which is likely used to redirect the user to a malicious site. The ML classifier also 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.cc/pify?keyword=chemistry+notes+for+class+9+in+urdu+pdf
    • http://files.mackarbag.com/uploads/1/3/0/7/130776131/xuvuxekuduxekizina.pdf
    • http://files.mad-promotions.com/uploads/1/3/1/0/131070612/7889713.pdf
    • http://files.tabletimedecorlinens.com/uploads/1/3/2/7/132710780/jinowem.pdf
    • http://files.lidgettandbeyond.org/uploads/1/3/1/3/131398134/rodenak_jugagisedopujon_banere.pdf
    • https://cdn.shopify.com/s/files/1/0432/7574/7484/files/ascii_one_line_art.pdf
    • https://cdn.shopify.com/s/files/1/0438/4089/7174/files/participle_adjectives_exercises_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0432/5687/3128/files/fasuvoxunamowazubuwawipet.pdf
    • https://cdn.shopify.com/s/files/1/0446/6376/7203/files/british_english_grammar_download.pdf
    • https://cdn.shopify.com/s/files/1/0437/0546/7035/files/list_of_new_appointments_2020.pdf
    • https://cdn.shopify.com/s/files/1/0430/6052/7253/files/shk_berichtsheft_vorlagen.pdf
    • https://cdn.shopify.com/s/files/1/0432/6716/2276/files/32867371797.pdf
    • https://cdn.shopify.com/s/files/1/0431/7279/0427/files/gamekepagedakoxubeka.pdf
    • https://cdn.shopify.com/s/files/1/0430/1357/0709/files/91467228777.pdf
    • https://cdn.shopify.com/s/files/1/0437/9911/7986/files/3692002787.pdf
    • https://cdn.shopify.com/s/files/1/0437/8768/1952/files/circuit_breaker_maintenance.pdf
    • https://cdn.shopify.com/s/files/1/0432/0333/0209/files/77873067975.pdf
    • https://cdn.shopify.com/s/files/1/0441/2293/1352/files/meruturowenepotopokekezon.pdf
    • https://cdn.shopify.com/s/files/1/0433/8316/0995/files/cecily_amanda_m._forrell_instagram.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_off000060ad.bin
1e1aaabed1c930b9619b640c7e56bac10143f0163f533e76e3856c1dd65e59d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60AD 5556 bytes
font_01_sfnt_off00007369.bin
f3f0bae994117170db392257754c9a0b4f60f1ab64278f387b79bb57de6ffbbf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7369 9724 bytes

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