Malicious PDF — malware analysis report

Static analysis result for SHA-256 c583a377693472bd…

MALICIOUS

PDF

56.2 KB Created: 2020-08-31 18:39:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 08c8761c2e2464ebc4ef1253c6594bfb SHA-1: 28fabe6dde8ac6a7b86027e68a7e76f359ac3222 SHA-256: c583a377693472bd639e8717dece13afdd89dc9c47315dd37cb691dbd0a143ec
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1200 Hardware Add-in Systems

The PDF was flagged by a critical heuristic for linking to known malicious redirector infrastructure. Additionally, another critical heuristic identified it as a PDF link farm containing numerous external links. The ML classifier also strongly indicated maliciousness. The primary IOC is the malicious redirector URL, which is likely the initial step in a phishing or redirection chain.

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/wix?keyword=javascript+concat+vs+push+performance
    • https://static.usrfiles.com/ugd/89064d_512854164ec24c94be6aa2fc85ec018c.pdf
    • https://static.usrfiles.com/ugd/f63f29_f1f088e39608489aa4526f2f9c6ec8d5.pdf
    • https://static.usrfiles.com/ugd/e5a943_642042288ad74f6abec9f8a02c32604c.pdf
    • https://static.usrfiles.com/ugd/b8c837_c501d8fa13944c5da4245ccb5664cdc9.pdf
    • https://static.usrfiles.com/ugd/a44510_ac24a8f942344eb1ac1f1b917e3fabae.pdf
    • https://cdn.shopify.com/s/files/1/0432/9344/2208/files/tennis_elbow_treatment_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0429/4295/5687/files/livre_apprendre_python.pdf
    • https://cdn.shopify.com/s/files/1/0428/3976/9254/files/63021277696.pdf
    • https://cdn.shopify.com/s/files/1/0455/4008/1829/files/axially_loaded_bar.pdf
    • https://cdn.shopify.com/s/files/1/0464/8042/5112/files/35054623892.pdf
    • https://cdn.shopify.com/s/files/1/0432/7525/5972/files/65790194741.pdf
    • https://cdn.shopify.com/s/files/1/0430/5797/1354/files/chinese_zodiac_movie_in_tamilyogi.pdf
    • https://cdn.shopify.com/s/files/1/0431/6626/9597/files/tipafuz.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/42539854631.pdf
    • https://cdn.shopify.com/s/files/1/0430/7160/2855/files/vebutoxizozedo.pdf
    • https://cdn.shopify.com/s/files/1/0437/2873/2314/files/33608236464.pdf
    • https://cdn.shopify.com/s/files/1/0428/1883/0503/files/joindre_un_dans_messenger.pdf
    • https://cdn.shopify.com/s/files/1/0432/5575/9011/files/69564711430.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007225.bin
9dc86b30556b6d0927fad32e333a52bd8d052f9c03722f81a556fbd385596141		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7225 5272 bytes
font_01_sfnt_off000083f2.bin
444ac304ca35e773723eb04b383247b96758d6dd9590fafc679c303dd17b7fde		 pdf-font-stream PDF embedded font (sfnt) at offset 0x83F2 3028 bytes
font_02_sfnt_off0000903a.bin
05a1f010cdb7e636d7b5353183ac1c887e8c7248e4487d1292a97d787e6ce866		 pdf-font-stream PDF embedded font (sfnt) at offset 0x903A 13792 bytes
font_03_sfnt_off0000bc31.bin
82cda965514ef585b81d48e93886242cca31dac7f009f7bf752b6b6c743b9b27		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBC31 16728 bytes

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