Malicious PDF — malware analysis report

Static analysis result for SHA-256 01596c294c19d1c0…

MALICIOUS

PDF

42.3 KB Created: 2020-08-14 18:39:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8388e1cdf6066c50f53f46643c5533c0 SHA-1: fb73ef723a3d9d1aa5ac41c19932c901d2bb1cb4 SHA-256: 01596c294c19d1c07ccad4de7130c75b6d9ae9f5c6f15315b62311723722e040
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a critical heuristic firing for a malicious redirector link, which is a primary indicator of malicious intent. It also exhibits characteristics of a link farm, with numerous embedded URLs pointing to other PDF files, likely for SEO manipulation or to distribute further malicious content. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/wb?keyword=applied%20mathematics%20m3%20notes%20pdf
    • http://bomew.my31sisters.org/uploads/1/3/2/8/132815793/233e138c9.pdf
    • http://xosedit.trupointkennel.com/uploads/1/3/2/3/132303219/3863003.pdf
    • http://files.grundmeyerleadersearch.com/uploads/1/3/1/6/131636990/sifixoj_jutixepipi_bevasagipaxuja_sivosukisozi.pdf
    • http://files.bluesynergyassociates.com/uploads/1/3/0/7/130775758/1dedcf5d4.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/8688/9625/files/pimuxupozikerunajoxejagir.pdf
    • https://cdn.shopify.com/s/files/1/0433/1097/3083/files/42666985148.pdf
    • https://cdn.shopify.com/s/files/1/0435/2750/4024/files/11957289895.pdf
    • https://cdn.shopify.com/s/files/1/0438/6711/1584/files/boilie_rezepte.pdf
    • https://cdn.shopify.com/s/files/1/0436/9930/6648/files/39181551765.pdf
    • https://cdn.shopify.com/s/files/1/0435/3071/5288/files/rulirug.pdf
    • https://cdn.shopify.com/s/files/1/0439/2943/6315/files/baby_names_boy_tamil_list.pdf
    • https://cdn.shopify.com/s/files/1/0450/1300/8534/files/cardiopatia_isquemica_cronica_2020.pdf
    • https://cdn.shopify.com/s/files/1/0427/4513/5260/files/faxonosuzovovipaxuzupe.pdf
    • https://cdn.shopify.com/s/files/1/0439/8622/3262/files/papizopuvonewamezinovefe.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/48466687054.pdf
    • https://cdn.shopify.com/s/files/1/0430/1013/0073/files/viliwurize.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005ca7.bin
58d29171f8e0097e551afcc5fdef364dc5ca19c8b285605ce0de0950a40a9dad		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5CA7 5452 bytes
font_01_sfnt_off00006f08.bin
33d80b5e357abfa3ea91f5eff18928953f8e36d8e9a7aea158c838e8ae756dd9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F08 2116 bytes
font_02_sfnt_off000078d2.bin
a7f3e4f0e1c768404f9f9b1ceae4167cdccced134f37c6c42f7baf1f310ba61a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78D2 10260 bytes

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