Malicious PDF — malware analysis report

Static analysis result for SHA-256 4425cf4822b2bc0d…

MALICIOUS

PDF

53.5 KB Created: 2020-08-04 02:03:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f682d1d1ba8b31111ee7d5270cd57a6c SHA-1: b198f25b4c4769b6ebd007917aa0772be03c1e4d SHA-256: 4425cf4822b2bc0d2b795c3774b9ab690e881c4c1495e9edbec436086335285b
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing indicating a malicious redirector. The document body, though partially corrupted, contains text related to a 'free niv study bible pdf download' and the malicious URL. This suggests a social engineering lure to drive traffic 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.com/pify?keyword=free+niv+study+bible+pdf+download
    • http://files.cirrusskyfarms.com/uploads/1/3/1/0/131070688/7089838.pdf
    • http://files.mrsbrownsmusicroom.com/uploads/1/3/1/3/131379833/4808061.pdf
    • http://files.abrairalab.org/uploads/1/3/0/7/130738622/xagawewidulu_vosaguf.pdf
    • http://files.graceplacedancefitnessfun.com/uploads/1/3/2/6/132682768/zixawibekolebokel.pdf
    • https://cdn.shopify.com/s/files/1/0433/4957/3784/files/10753144059.pdf
    • https://cdn.shopify.com/s/files/1/0429/4773/9811/files/muwimubezimagokusikeniva.pdf
    • https://cdn.shopify.com/s/files/1/0432/4291/3952/files/13844377262.pdf
    • https://cdn.shopify.com/s/files/1/0429/9636/7511/files/strophic_vs_through_composed.pdf
    • https://cdn.shopify.com/s/files/1/0434/1976/2840/files/18185055058.pdf
    • https://cdn.shopify.com/s/files/1/0437/6992/1690/files/zoromexepewuzimat.pdf
    • https://cdn.shopify.com/s/files/1/0431/5542/3383/files/gavejolijonubu.pdf
    • https://cdn.shopify.com/s/files/1/0432/8259/6000/files/dosegunisikunup.pdf
    • https://cdn.shopify.com/s/files/1/0436/0273/9362/files/sukupusosuz.pdf
    • https://cdn.shopify.com/s/files/1/0427/9199/3500/files/suvufigidujevemevotedalo.pdf
    • https://cdn.shopify.com/s/files/1/0434/0563/9836/files/27739036411.pdf
    • https://cdn.shopify.com/s/files/1/0434/3509/8264/files/wobudipuwe.pdf
    • https://cdn.shopify.com/s/files/1/0428/4982/9023/files/25399448303.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007ad3.bin
27f99c6c2687d79c92ce1af75029cfd0c380c83531949cb73578575b3fe8429c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7AD3 5384 bytes
font_01_sfnt_off00008d4a.bin
981b8339820d796b25990aa4f518814d77265997da7fa318d625e9e88e3e1a73		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D4A 10344 bytes
font_02_sfnt_off0000b0bb.bin
4e81f7b442146c13bd75a218ae3f80c02e2dd57bd48add79a4daeae5976ab327		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB0BB 16452 bytes

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