Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ffeb772269641a4…

MALICIOUS

PDF

44.0 KB Created: 2020-08-10 10:42:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7e4061744d94932122bfb82d89bbe683 SHA-1: 0dc4f67728ef0a92974996ba5cb6502e192dd9d5 SHA-256: 6ffeb772269641a40e109eeb0628e4c5bf3de54c329d094f4a215a5e4f91113f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, with one heuristic specifically identifying it as a PDF SEO link farm. One of these links, 'https://ttraff.ru/pify?keyword=tonight+west+side+story+piano+pdf', is flagged as pointing to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. The document body is heavily obfuscated and contains the same suspicious URLs, suggesting an attempt to drive traffic to malicious 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.ru/pify?keyword=tonight+west+side+story+piano+pdf
    • http://kubodovuz.robbavister.com/uploads/1/3/1/3/131379833/2843705.pdf
    • http://files.lyndsayrice.com/uploads/1/3/1/3/131383838/603f3c5bb2fc3f.pdf
    • http://files.alexandriaprevents.com/uploads/1/3/1/4/131406849/nufomub-lunonul-bisemuseme-timujevurosune.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/0408/4899/files/jaditinowazakixijara.pdf
    • https://cdn.shopify.com/s/files/1/0429/6104/3605/files/40105133917.pdf
    • https://cdn.shopify.com/s/files/1/0434/2490/7414/files/72426960205.pdf
    • https://cdn.shopify.com/s/files/1/0431/5004/9448/files/75857288811.pdf
    • https://cdn.shopify.com/s/files/1/0429/6785/9359/files/65327047340.pdf
    • https://cdn.shopify.com/s/files/1/0433/2208/1448/files/zilazesakefejorusifopav.pdf
    • https://cdn.shopify.com/s/files/1/0445/9751/0308/files/barkley_np_review.pdf
    • https://cdn.shopify.com/s/files/1/0431/3517/2770/files/aptitude_topics_list.pdf
    • https://cdn.shopify.com/s/files/1/0430/5689/0013/files/vavuwodovejizej.pdf
    • https://cdn.shopify.com/s/files/1/0431/0699/2289/files/psychological_testing_ebook.pdf
    • https://cdn.shopify.com/s/files/1/0432/7840/1700/files/jabazukudaborilarazazope.pdf
    • https://cdn.shopify.com/s/files/1/0430/2897/1681/files/saxexof.pdf
    • https://cdn.shopify.com/s/files/1/0436/4340/4441/files/30650754883.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005234.bin
fa42719291cae2e234e1c7b113a130df1dad708d5141d50a401293f0354084e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5234 3532 bytes
font_01_sfnt_off00005ecf.bin
06143dd2dc354c1174d6cf215dd48ebee57b205637db5fe55970da6d0dc485bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5ECF 5416 bytes
font_02_sfnt_off00007151.bin
b3855cf35be6efb44039a1766ce698b2628ee7994e8e09f82c4b58a46ec56ec3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7151 14968 bytes

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