Malicious PDF — malware analysis report

Static analysis result for SHA-256 0403f8e0149d1008…

MALICIOUS

PDF

119.3 KB Created: 2020-08-12 03:06:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d26880b55342d698ed4f3071c442256c SHA-1: 3a12adbc5c4952a2833e86b45a155d2352d1d1fc SHA-256: 0403f8e0149d10080ca12f69035ec4fb365afa8b61ae2ded20348eee3ba50c3d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded links that redirect to a malicious URL, identified by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The document body, though heavily obfuscated, contains a reference to the same malicious URL. The presence of numerous external PDF links suggests a link farm or SEO manipulation tactic to disguise the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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/wb?keyword=grammar%20of%20the%20gothic%20language%20pdf
    • http://files.rosamysticaofamerica.org/uploads/1/3/0/7/130776403/zadedej-simuzojopipeb-wevexetimudiv-fiwixitari.pdf
    • http://files.slightlykneady.com/uploads/1/3/0/8/130813988/2158005.pdf
    • http://files.kghypnobirthingsouth.com/uploads/1/3/1/3/131379877/aa49db207d94da9.pdf
    • http://balagon.themindfulchristian.net/uploads/1/3/2/6/132682883/8ac6d55cee44.pdf
    • http://files.wekesa.net/uploads/1/3/2/6/132696598/e9678149de61d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0435/9723/4338/files/realistic_rock_carmine_appice.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rejukimuvili.pdf
    • https://cdn.shopify.com/s/files/1/0430/7153/7301/files/kanudotupufewubowa.pdf
    • https://cdn.shopify.com/s/files/1/0436/0100/2664/files/22977550365.pdf
    • https://cdn.shopify.com/s/files/1/0428/3708/2271/files/lg_g3_unlock.pdf
    • https://cdn.shopify.com/s/files/1/0429/2398/3001/files/mevumab.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/55166802931.pdf
    • https://cdn.shopify.com/s/files/1/0431/4228/3432/files/noriruzigulefijelimupegi.pdf
    • https://cdn.shopify.com/s/files/1/0430/3932/6365/files/kaxuxuzadegimes.pdf
    • https://cdn.shopify.com/s/files/1/0429/0471/5427/files/tidajagadusiloxoxutiz.pdf
    • https://cdn.shopify.com/s/files/1/0429/9610/5375/files/61045681303.pdf
    • https://cdn.shopify.com/s/files/1/0437/8856/6677/files/cat_416_backhoe_parts_manual.pdf
    • https://cdn.shopify.com/s/files/1/0427/3248/6823/files/winogala.pdf
    • https://cdn.shopify.com/s/files/1/0433/9341/7366/files/31974943755.pdf
    • https://cdn.shopify.com/s/files/1/0428/1496/3868/files/miller_welder_manual.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/
    • https://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013ae8.bin
674c76af1353fd81dfcf08a7453488e38160dc12a1eb5ebd8144ca09ed63f926		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13AE8 12088 bytes
font_01_sfnt_off0001586b.bin
97665c2e3edd45da125daf85c02847ace5cd38f3c104818e0e5f5f370e725ba7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1586B 5304 bytes
font_02_sfnt_off00016a4e.bin
5d4331d1eb8544e1587c3475eadab9499779c0a0b7175ff3becb055d14f2247b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16A4E 22884 bytes
font_03_sfnt_off0001abb6.bin
2650953734bc47387e7657ecfda98388c46aab4f6ce1b70d6c4123b7a8b84dab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1ABB6 16116 bytes
font_04_sfnt_off0001c090.bin
ad623bc7c681097dfa1224999cf6cc6072d3ca9a137655dc1129b0261f0b357c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1C090 4324 bytes

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