Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca54d670236c0a48…

MALICIOUS

PDF

47.9 KB Created: 2020-08-05 12:48:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d612e091f83ae9a010107e1cd948f75f SHA-1: 0255660ea5ded1e25585b0a98bf731908c5a2f64 SHA-256: ca54d670236c0a488580e8456fda2eb80f73368f9440a44888933e5d2a9b8070
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link to a known malicious redirector, ttraff.cc, which is disguised as an announcement memo. The ML classifier strongly indicates maliciousness. The document body, though heavily obfuscated, contains the same URL, suggesting the primary intent is to redirect the user to a malicious site.

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=announcement+memo+sample+pdf
    • http://files.marinchorus.org/uploads/1/3/1/3/131383664/lokaxafusanobo-buzemafiza-razuxufi-baremefakot.pdf
    • http://files.howardcountytaxicab.com/uploads/1/3/0/8/130813095/a81740.pdf
    • http://files.yogadiversityinitiative.org/uploads/1/3/2/7/132712282/mivilawowe.pdf
    • http://guxodoje.wyatthersey.com/uploads/1/3/0/7/130776208/4165522.pdf
    • http://files.wvswma.org/uploads/1/3/1/4/131453945/kitumukinuzawulide.pdf
    • https://cdn.shopify.com/s/files/1/0431/7390/4545/files/22263188366.pdf
    • https://cdn.shopify.com/s/files/1/0428/2161/5775/files/papowajobipafotaxirufa.pdf
    • https://cdn.shopify.com/s/files/1/0430/7730/4484/files/40487041578.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/japoxotoruzub.pdf
    • https://cdn.shopify.com/s/files/1/0429/4243/1395/files/open_file_in_browser_c.pdf
    • https://cdn.shopify.com/s/files/1/0432/0873/6928/files/marathi_bhakti_geet_download.pdf
    • https://cdn.shopify.com/s/files/1/0435/7967/0689/files/gagogozasetogifuvaf.pdf
    • https://cdn.shopify.com/s/files/1/0430/7812/3669/files/negonekakiwexufixemam.pdf
    • https://cdn.shopify.com/s/files/1/0428/3554/2182/files/81398694229.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/letowopebofowebizuwir.pdf
    • https://cdn.shopify.com/s/files/1/0430/9526/1348/files/97577403241.pdf
    • https://cdn.shopify.com/s/files/1/0429/1035/1513/files/40271384351.pdf
    • https://cdn.shopify.com/s/files/1/0431/4601/8967/files/occupational_exposure_band.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_off00007dfe.bin
f91beb3edb00bade1bd52a0214c421d97d81ffeeeb20cf6ab150d334193eed96
pdf-font-stream PDF embedded font (sfnt) at offset 0x7DFE 5196 bytes
font_01_sfnt_off00008f9f.bin
7c9557388448e3bd394a2de03110f8c818edd9462faaca5e4ad59fb5798615eb
pdf-font-stream PDF embedded font (sfnt) at offset 0x8F9F 10092 bytes