Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cae1883c2eb2042…

MALICIOUS

PDF

36.8 KB Created: 2020-08-25 16:33:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f44fa77cb39550dd39784f0785197a1b SHA-1: afcd947980b52fa02ee5a0a7e7f2c5501f8ec36f SHA-256: 6cae1883c2eb20421f3b21f5f913a79ab870244c5a17af4a58aecccc4037daf6
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with one specifically identified as a malicious redirector. The document body, though partially garbled, includes text that appears to be a song title, likely used as a lure to entice users to click the malicious link. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious redirector.

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=achyutam+keshavam+song++by+shreya+ghoshal
    • http://files.letspaintarabic.com/uploads/1/3/1/3/131379612/22ab9b14a11.pdf
    • http://files.nixonconstructionllc.com/uploads/1/3/2/3/132302928/bevej.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://cdn.shopify.com/s/files/1/0437/8466/7287/files/80238562836.pdf
    • https://cdn.shopify.com/s/files/1/0430/9942/2871/files/sigusuxelejifijuvegefu.pdf
    • https://cdn.shopify.com/s/files/1/0428/7932/0223/files/active_and_passive_voice_formula_chart.pdf
    • https://cdn.shopify.com/s/files/1/0430/7759/9383/files/60644735306.pdf
    • https://cdn.shopify.com/s/files/1/0428/3649/2444/files/form_d_under_bonus_act.pdf
    • https://cdn.shopify.com/s/files/1/0428/4032/6300/files/61631995231.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/fufabolip.pdf
    • https://cdn.shopify.com/s/files/1/0432/3796/5986/files/adb_list_packages.pdf
    • https://cdn.shopify.com/s/files/1/0429/8617/6665/files/set_theory_book.pdf
    • https://cdn.shopify.com/s/files/1/0440/2230/0822/files/relationship_marketing_thesis.pdf
    • https://cdn.shopify.com/s/files/1/0432/0159/3502/files/bidove.pdf
    • https://cdn.shopify.com/s/files/1/0437/3820/2273/files/52309761953.pdf
    • https://cdn.shopify.com/s/files/1/0435/9415/4146/files/94792020496.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_off00004490.bin
483ceca80cfb890b713665ae05a7d2a8fe208fdfa874bcbca6019c2042888401		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4490 5568 bytes
font_01_sfnt_off00005764.bin
c946c87ff1822a06ba793defc8b87a5920da7c7cd4a14cb10a29d991fd04be4f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5764 9672 bytes
font_02_sfnt_off000078d1.bin
8b82ec797abba3434c10cc7ef5d23eaecd598900e1f296d1946f43a9ee5043ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78D1 3372 bytes

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