Malicious PDF — malware analysis report

Static analysis result for SHA-256 5247e41c59a02dbc…

MALICIOUS

PDF

36.7 KB Created: 2020-08-15 14:47:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fbe6521633aad45a1d80e744c0eeed9f SHA-1: 28059cadab755b65c4fb2f46965174c740740563 SHA-256: 5247e41c59a02dbc28cb11f38ec52a5ec530163a5f8b250ce426edc787d2dc3e
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 pointing to a known malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external PDF links, suggesting a tactic to manipulate search results or distribute further malicious content. The ML classifier strongly supports the malicious verdict. No scripts were extracted, limiting the analysis of direct execution behavior.

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=bootstrap+form+generator+3
    • http://files.dosisquares.org/uploads/1/3/1/4/131411088/zuliwiwufenule-vabiw-suzukajurexo.pdf
    • http://files.bellinghaminspector.com/uploads/1/3/1/6/131637953/9570836.pdf
    • http://files.jmbpaperhangers.com/uploads/1/3/1/3/131380126/9584488.pdf
    • http://kelas.cutediner.com/uploads/1/3/1/4/131408280/4fc56952.pdf
    • https://cdn.shopify.com/s/files/1/0434/4479/7600/files/nojifakisipagumo.pdf
    • https://cdn.shopify.com/s/files/1/0436/1053/8147/files/bitcoin_wallet_android_restore.pdf
    • https://cdn.shopify.com/s/files/1/0438/0462/3010/files/31788325959.pdf
    • https://cdn.shopify.com/s/files/1/0433/0212/5733/files/76118517008.pdf
    • https://cdn.shopify.com/s/files/1/0429/0409/2828/files/contemporary_issues_in_financial_reporting.pdf
    • https://cdn.shopify.com/s/files/1/0431/3461/5706/files/florida_title_fee_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0437/6444/9437/files/can_t_help_falling_in_love_piano_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0431/1810/0637/files/english_writing_skills_in_bangla.pdf
    • https://cdn.shopify.com/s/files/1/0431/0102/8503/files/rukotexirelufibezog.pdf
    • https://cdn.shopify.com/s/files/1/0428/9154/2681/files/namebediraratawuxa.pdf
    • https://cdn.shopify.com/s/files/1/0436/3275/4841/files/12575808689.pdf
    • https://cdn.shopify.com/s/files/1/0437/7070/8125/files/cassava_production_guide_in_the_philippines.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_off00005288.bin
abd9a7932948c69d89a4f1128f0eae9b0829513eae77eb0250856916263dc1cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5288 5404 bytes
font_01_sfnt_off000064dc.bin
6fd1518aa1096dc301030e06248e953e452f20f20136e394a170fbfb04df227b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64DC 9860 bytes

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