Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4c644ee053baf82…

MALICIOUS

PDF

64.1 KB Created: 2020-07-15 23:46:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fb9920883cf3e4a91423805a028568f4 SHA-1: ddc8546c7b108371be143947e83e1e8bd8993f43 SHA-256: d4c644ee053baf82c0087fa1776c49639fe045ab3b7242fc40bbd7f59daef19f
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, suggests a lure related to physics exercises. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK confirms the presence of a link to known malicious infrastructure, and ML_NYX_PDF_MALICIOUS indicates a high probability of maliciousness. The primary attack vector appears to be directing users to a malicious site via a deceptive link within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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.ru/pify?keyword=ejercicios+resueltos+de+caida+libre+fisica+1+en+pdf
    • http://files.theplayfactoryplaygroup.com/uploads/1/3/2/6/132695813/vizakeper.pdf
    • http://files.psychoneirology.org/uploads/1/3/1/4/131455621/mawumuli-gotupebamopoxot-lixusogovam.pdf
    • http://files.ptnightout.org/uploads/1/3/0/7/130740432/ruzeximanuz_tivujap.pdf
    • http://files.neganeon.com/uploads/1/3/0/8/130873758/zataligijipifu.pdf
    • http://files.ptnightout.org/uploads/1/3/0/7/1
    • https://vefevomite.files.wordpress.com/2020/07/65939059495.pdf
    • https://jolitogobase57815693.files.wordpress.com/2020/06/dosigokoder.pdf
    • https://bekakum.files.wordpress.com/2020/07/vubisarefirenezal.pdf
    • https://zusuxomo.files.wordpress.com/2020/07/53937344138.pdf
    • https://nezirirotur.files.wordpress.com/2020/07/21347825092.pdf
    • https://fajetiw.files.wordpress.com/2020/06/fegokivijekerofitin.pdf
    • https://pimudan.files.wordpress.com/2020/06/58829319698.pdf
    • https://sowupaxi.files.wordpress.com/2020/06/wobekumaduga.pdf
    • https://ditilepikap.files.wordpress.com/2020/06/jazigawobenimarilelunojuj.pdf
    • https://xojusapa.files.wordpress.com/2020/07/46130987315.pdf
    • https://cdn.shopify.com/s/files/1/0428/3963/8179/files/99661843890.pdf
    • https://cdn.shopify.com/s/files/1/0429/6127/2983/files/dutofixuwarogelezejosif.pdf
    • https://cdn.shopify.com/s/files/1/0429/7188/9817/files/15525033315.pdf
    • https://cdn.shopify.com/s/files/1/0429/3646/7619/files/48044340136.pdf
    • https://cdn.shopify.com/s/files/1/0430/7140/6237/files/55831411897.pdf
    • https://cdn.shopify.com/s/files/1/0435/3504/0664/files/80384124912.pdf
    • https://cdn.shopify.com/s/files/1/0431/1125/2132/files/68157900196.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kesazemoluvumexon.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/tugogesobiwem.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000085c8.bin
2ce5a7286efefc5aae27ce1c31b3347e159d00bd30cf97f509a0b7f7d49caffb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x85C8 6440 bytes
font_01_sfnt_off000095bd.bin
7638ef0b197dbd4301f6c636d9340206e4ada01628525496924c9fbb5535421e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x95BD 5256 bytes
font_02_sfnt_off0000a79d.bin
39878feba0496c8616ff3883a7711ba9d9f9e79980897da1cc02919626f283f6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA79D 3676 bytes
font_03_sfnt_off0000b599.bin
b12720d1bbb3df782ef82517db5148b7c6b772ba43ce51e1dc61279a01f1978b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB599 10956 bytes
font_04_sfnt_off0000d94f.bin
f3b95f1269985bafc3dfb9b5b35e76df8a4d57039a143c013aed99c7cf3a4a89		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD94F 16344 bytes

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