Malicious PDF — malware analysis report

Static analysis result for SHA-256 e21965c138aaee9d…

MALICIOUS

PDF

41.2 KB Created: 2020-08-23 15:50:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c78d611e3ff8816aa766c5c974145e18 SHA-1: 7417fb236a75a84562b8a988d71c18cdafff5273 SHA-256: e21965c138aaee9d66108dcc5c63bbc3cbd014ae19f5f67a6d02442d2b4a19c7
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, with one identified as a malicious redirector. The ML classifier also flagged the PDF as malicious. The document body, though heavily obfuscated, contains a URL that appears to be part of a link farm strategy, likely intended to manipulate search engine results or lead users to 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=keyes+arduino+starter+kit+manual
    • http://files.martinsburgflipside.com/uploads/1/3/1/8/131871433/9608765.pdf
    • http://wubojuz.honeybeeconsulting.org/uploads/1/3/2/7/132740718/6098759.pdf
    • http://files.libbyyouthsoccer.org/uploads/1/3/1/3/131382239/ff727dd.pdf
    • https://cdn.shopify.com/s/files/1/0433/8850/2174/files/zakixoputaguloxebedovod.pdf
    • https://cdn.shopify.com/s/files/1/0436/6575/2217/files/another_one_bites_the_dust_bass_tabs.pdf
    • https://cdn.shopify.com/s/files/1/0433/3407/4523/files/repudobulumexemid.pdf
    • https://cdn.shopify.com/s/files/1/0433/8266/9461/files/manualidades_con_reciclado.pdf
    • https://cdn.shopify.com/s/files/1/0433/7192/1571/files/xelazalito.pdf
    • https://cdn.shopify.com/s/files/1/0431/2232/7706/files/hastie_statistical_learning.pdf
    • https://cdn.shopify.com/s/files/1/0434/8100/6246/files/f12_mp4_chrome.pdf
    • https://cdn.shopify.com/s/files/1/0433/1952/5531/files/pcr_protocol_steps.pdf
    • https://cdn.shopify.com/s/files/1/0428/1165/4307/files/84472192771.pdf
    • https://cdn.shopify.com/s/files/1/0434/0423/0805/files/nosorivavigunazositit.pdf
    • https://cdn.shopify.com/s/files/1/0433/5819/1768/files/71203928807.pdf
    • https://cdn.shopify.com/s/files/1/0435/5522/5763/files/pewadikofisoxevobezo.pdf
    • https://cdn.shopify.com/s/files/1/0430/3775/3501/files/23746438400.pdf
    • https://cdn.shopify.com/s/files/1/0432/5317/0334/files/jimirarifelumodutivi.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/
    • https://cdn.shopify.com/s/files/1/0432/5317/0334/files/jimirarifelumodu

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000644e.bin
ab53c223eff7e51780d1b40f95803c961ce904789d5789bc7fe5e5b179a42730		 pdf-font-stream PDF embedded font (sfnt) at offset 0x644E 5108 bytes
font_01_sfnt_off0000759b.bin
079cb2fed40da421228615346af4bddb194160c46702dacb253c20fe4a14165e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x759B 10024 bytes

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