Malicious PDF — malware analysis report

Static analysis result for SHA-256 688fa85274fc777f…

MALICIOUS

PDF

44.1 KB Created: 2020-08-06 05:21:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8e753c8e5e8882715082bbf7a7282ef9 SHA-1: e7aa2f97644f4c9336cf053f33b3f8a0057e547b SHA-256: 688fa85274fc777fe132f0999ffbc7c579064f7b5e969be4c73cf46dc40a3ef9
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a redirector infrastructure. The document body, though corrupted, contains text suggesting it is a PDF about learning French, which is likely a lure. The primary malicious URL identified is https://ttraff.cc/pify?keyword=comment+apprendre+fran%25C3%25A7ais+pdf, which is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness.

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=comment+apprendre+fran%25C3%25A7ais+pdf
    • http://files.littledenblog.com/uploads/1/3/0/7/130775373/woxuzu.pdf
    • http://files.lizcolter.com/uploads/1/3/2/6/132683154/wujoxakogixij-vipamapaleb-mimugefe.pdf
    • http://files.msacf.org/uploads/1/3/0/9/130968961/9063426.pdf
    • http://puwuwugo.sophisticatedfit.com/uploads/1/3/0/7/130738799/fitajilexomofifubanu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0449/0254/7611/files/causes_and_management_of_stress_at_work.pdf
    • https://cdn.shopify.com/s/files/1/0430/4109/5834/files/42004229168.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/bararilisubolubudikolumo.pdf
    • https://cdn.shopify.com/s/files/1/0433/1651/0873/files/34648759398.pdf
    • https://cdn.shopify.com/s/files/1/0427/7354/5116/files/14996877014.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/33435760041.pdf
    • https://cdn.shopify.com/s/files/1/0431/7318/3643/files/donobuxerukafij.pdf
    • https://cdn.shopify.com/s/files/1/0429/2971/7407/files/xixolakaxebemokilivovuvub.pdf
    • https://cdn.shopify.com/s/files/1/0433/3309/1480/files/37764391928.pdf
    • https://cdn.shopify.com/s/files/1/0431/2757/0596/files/29437089052.pdf
    • https://cdn.shopify.com/s/files/1/0428/1666/7815/files/chronic_stable_angina.pdf
    • https://cdn.shopify.com/s/files/1/0429/9508/9559/files/arabian_nights_malayalam_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/9051/7911/files/pujuxedokejokuxokelaluku.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006ac7.bin
763bd813c326f90ca3aca957bd88699cfac8bc16a710fdafef7380bbdd16104b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6AC7 5240 bytes
font_01_sfnt_off00007c81.bin
e26b1489601d30c6f0339647dfa15f62d3d926616972d6b7083d4283e60cc8b9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C81 11628 bytes

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