Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e8253bd137c65a4…

MALICIOUS

PDF

42.8 KB Created: 2020-08-26 22:29:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ee2c976e21ac3f5f47ce6f46e4dabad4 SHA-1: e39e84eb531d110f3ecd71aa0eb2b7f6e42422db SHA-256: 9e8253bd137c65a40dbc5fadc830e8f08b543526b3591f436ef855903cef3d10
152 Risk Score

Malware Insights

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

The PDF contains a mass of external links, with the primary link pointing to a known malicious redirector. The document body text, while heavily obfuscated, contains the malicious URL and appears to be a lure related to sheet music. The ML classifier strongly indicated maliciousness, and the PDF_MALICIOUS_REDIRECTOR_LINK heuristic confirms the presence of a link to malicious infrastructure.

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=butterfly+waltz+piano+and+violin+sheet+music+free
    • http://files.nutricionbasadaentrofologia.com/uploads/1/3/1/8/131856646/8176615.pdf
    • http://files.noon2moon.com/uploads/1/3/0/7/130775727/ginalokasofu_mufujijigofo.pdf
    • http://files.wnyata.com/uploads/1/3/1/0/131069950/7471704.pdf
    • http://fadez.maggiegreenwayart.com/uploads/1/3/1/4/131438003/2076b.pdf
    • http://tubok.rosemarygallagher.com/uploads/1/3/0/8/130814328/lokabupaw.pdf
    • https://cdn.shopify.com/s/files/1/0431/5712/7336/files/arabic_letters_to_english.pdf
    • https://cdn.shopify.com/s/files/1/0466/3951/3765/files/jessie_s_girl_mary_lambert_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0431/9592/4640/files/riwimadumafaxe.pdf
    • https://cdn.shopify.com/s/files/1/0440/8115/2152/files/leetcode_number_of_islands.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xasaxikopakepiditewevumub.pdf
    • https://cdn.shopify.com/s/files/1/0428/4504/4892/files/apstolos_augustus_nicodemus.pdf
    • https://cdn.shopify.com/s/files/1/0433/6576/1176/files/50095378742.pdf
    • https://cdn.shopify.com/s/files/1/0429/6107/6387/files/blowin_in_the_wind_piano.pdf
    • https://cdn.shopify.com/s/files/1/0437/9102/4277/files/51118224375.pdf
    • https://cdn.shopify.com/s/files/1/0432/7863/1072/files/24836023300.pdf
    • https://cdn.shopify.com/s/files/1/0437/0730/2037/files/2005_dodge_durango_repair_manual.pdf
    • https://cdn.shopify.com/s/files/1/0438/3608/0288/files/47680849540.pdf
    • https://cdn.shopify.com/s/files/1/0428/5323/6902/files/79998920464.pdf
    • https://cdn.shopify.com/s/files/1/0430/8434/9591/files/famoxonefejodepebekiba.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_off0000582a.bin
c45364d0602d152a957554fd540f30a6b7bbbeeb4ec670d273093f19f6b4c9e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x582A 5748 bytes
font_01_sfnt_off00006bae.bin
32b7b8661c4adfa6c71b1acfced315dc471badc89f6b8f1ee594cdf0119eadf9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BAE 15340 bytes

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