Malicious PDF — malware analysis report

Static analysis result for SHA-256 fee44c1e5d8d8827…

MALICIOUS

PDF

44.6 KB Created: 2020-08-14 08:46:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 145f99d21cc98b3b3224fc71bd96641a SHA-1: 8f9163cc5a7a733ebc555a9932b0c51ddf2a0e7d SHA-256: fee44c1e5d8d88272751acc6ea43c0a78eda4b52ff3424dd7bd58753e050d768
152 Risk Score

Malware Insights

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

The PDF document was flagged as malicious by a machine learning classifier and contains links to known malicious redirector infrastructure. It also exhibits characteristics of a PDF link farm, with a large number of embedded URLs pointing to external resources. The document body contains garbled text but includes the URL https://ttraff.ru/pify?keyword=sas+libname+xlsx+multiple+sheets, which is associated with malicious redirector activity. The primary attack pattern appears to be SEO manipulation or a lure to redirect users to potentially harmful content.

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.ru/pify?keyword=sas+libname+xlsx+multiple+sheets
    • http://files.cancunrivieramaya.tours/uploads/1/3/1/4/131406506/dodevojug.pdf
    • http://bekonip.case.coach/uploads/1/3/0/8/130874592/2310142.pdf
    • http://files.veteransmemorialhighway36.com/uploads/1/3/1/4/131407051/detilug.pdf
    • http://files.norwaynemusic.com/uploads/1/3/2/7/132741225/dc229fc9381.pdf
    • https://cdn.shopify.com/s/files/1/0431/9887/3762/files/13703514344.pdf
    • https://cdn.shopify.com/s/files/1/0430/3051/1779/files/40291025509.pdf
    • https://cdn.shopify.com/s/files/1/0438/2661/0333/files/17132470963.pdf
    • https://cdn.shopify.com/s/files/1/0427/8799/5814/files/tikerobetepamokateren.pdf
    • https://cdn.shopify.com/s/files/1/0431/4890/2554/files/base64_javascript.pdf
    • https://cdn.shopify.com/s/files/1/0431/2111/5298/files/56423383296.pdf
    • https://cdn.shopify.com/s/files/1/0447/9864/0288/files/robert_sedgewick_algorithms_c.pdf
    • https://cdn.shopify.com/s/files/1/0438/7468/0987/files/56793975524.pdf
    • https://cdn.shopify.com/s/files/1/0431/2409/7175/files/70162597989.pdf
    • https://cdn.shopify.com/s/files/1/0436/0414/8381/files/wieland_and_memoirs_of_carwin_the_biloquist.pdf
    • https://cdn.shopify.com/s/files/1/0428/7827/1651/files/paxuk.pdf
    • https://cdn.shopify.com/s/files/1/0430/6249/3345/files/24118418107.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_off00006da8.bin
366f1bd4ad0943d376f15cc6159c5255235d1e64b93d62c47527562e11d5a579		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DA8 5276 bytes
font_01_sfnt_off00007f6a.bin
9f158d22aee3bfbdc43513f1ccfc2779fa3e50431f216faf275198892efaa53b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F6A 11616 bytes

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