Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd2d080b183411dd…

MALICIOUS

PDF

52.3 KB Created: 2020-08-09 01:02:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 38c6d1d085b04820f62c8fb210a0aca6 SHA-1: 289f59e0021d6061ac3729e028793f54e074000d SHA-256: dd2d080b183411dd4d148bac798800ee9ecc745c3fedbfb0a48153e0742ed561
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 for a malicious redirector. The document body, though partially corrupted, contains text related to academic topics and includes the primary malicious URL. The ML classifier strongly indicated maliciousness, and the overall structure suggests a link farm designed to redirect users to potentially harmful sites.

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=chapter+5+activity+based+costing+and+activity+based+management+pdf
    • http://bewuk.serenepierce.com/uploads/1/3/1/4/131482976/jesawo-jatoleribe-mejekigemelol.pdf
    • http://files.corkgp.com/uploads/1/3/1/6/131637302/piwinijosij_kujunadiwov_tawaj.pdf
    • http://files.pugetsoundfarmtables.com/uploads/1/3/0/7/130776055/8720153.pdf
    • https://cdn.shopify.com/s/files/1/0438/1127/4914/files/difference_between_rip_ospf_eigrp_and_bgp.pdf
    • https://cdn.shopify.com/s/files/1/0431/6859/6123/files/73832503587.pdf
    • https://cdn.shopify.com/s/files/1/0435/2468/5976/files/arcane_trickster_guide.pdf
    • https://cdn.shopify.com/s/files/1/0433/3495/9259/files/kunuguvomovef.pdf
    • https://cdn.shopify.com/s/files/1/0429/6579/4965/files/10282225155.pdf
    • https://cdn.shopify.com/s/files/1/0433/8191/5802/files/dabegolufexinevusad.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/vibamiwa.pdf
    • https://cdn.shopify.com/s/files/1/0438/9008/1944/files/xigubu.pdf
    • https://cdn.shopify.com/s/files/1/0432/5467/7662/files/zagijubifexiwo.pdf
    • https://cdn.shopify.com/s/files/1/0431/9005/9157/files/vigotimobasoxujuzaxomow.pdf
    • https://cdn.shopify.com/s/files/1/0440/6162/2437/files/ihk_koblenz_berichtsheft_vorlage.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_off00008bb5.bin
40a2567e9afcb1975eb422ee2d730bd13652d5c584906922d83ca577418110df
pdf-font-stream PDF embedded font (sfnt) at offset 0x8BB5 5868 bytes
font_01_sfnt_off00009f8f.bin
362529d4475a51b7feaaf8beb492095f9a56c65088900a58669ed915337dde89
pdf-font-stream PDF embedded font (sfnt) at offset 0x9F8F 10748 bytes