Malicious PDF — malware analysis report

Static analysis result for SHA-256 15ebd4160a69b2f9…

MALICIOUS

PDF

47.8 KB Created: 2020-08-06 06:39:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: da02071218e2370b19d784ccd7bd6853 SHA-1: 107e8ffca6379b4fa4186f9b0597dfe69b076860 SHA-256: 15ebd4160a69b2f9f610defa8a4c9c5c72accd694552d2de15b5bbc13d1c3030
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically the URL https://ttraff.com/pify?keyword=muatan+dan+medan+listrik.+pdf. Additionally, the document exhibits characteristics of a PDF link farm, embedding numerous external PDF links, many of which are hosted on Shopify. The ML classifier also strongly indicated maliciousness. While no scripts were directly extracted, the embedded URLs and the nature of the heuristics suggest an attempt to lure users to malicious sites, likely for further exploitation or phishing.

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.com/pify?keyword=muatan+dan+medan+listrik.+pdf
    • http://kirav.velaband.org/uploads/1/3/0/7/130739024/bukurefas.pdf
    • http://felunofo.helenmccreery.com/uploads/1/3/1/3/131379803/wemivogel_fulaxati_xewipunoxum_diropuragop.pdf
    • http://files.homescholars.org/uploads/1/3/0/7/130738696/zimirimuzen.pdf
    • http://files.biggsbassethounds.com/uploads/1/3/1/8/131857071/84fb7a2093dbc.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/6022/3397/files/the_good_morrow.pdf
    • https://cdn.shopify.com/s/files/1/0430/9080/4893/files/53179077014.pdf
    • https://cdn.shopify.com/s/files/1/0435/6263/1326/files/wakisuzasijitomoj.pdf
    • https://cdn.shopify.com/s/files/1/0431/8602/8708/files/backstepping_controller.pdf
    • https://cdn.shopify.com/s/files/1/0431/5208/1053/files/proletariat_vs_bourgeoisie.pdf
    • https://cdn.shopify.com/s/files/1/0431/8858/4605/files/sacramento_tv_listings.pdf
    • https://cdn.shopify.com/s/files/1/0432/5064/7204/files/29178155895.pdf
    • https://cdn.shopify.com/s/files/1/0429/7087/4009/files/nutilajudi.pdf
    • https://cdn.shopify.com/s/files/1/0433/1061/2635/files/69636376823.pdf
    • https://cdn.shopify.com/s/files/1/0434/4738/6262/files/essentials_of_investments.pdf
    • https://cdn.shopify.com/s/files/1/0431/2816/0420/files/pdf_of_a_beta_distribution.pdf
    • https://cdn.shopify.com/s/files/1/0428/5032/0543/files/61951544841.pdf
    • https://cdn.shopify.com/s/files/1/0444/0326/1606/files/binging_with_babish_cookbook_free.pdf
    • https://cdn.shopify.com/s/files/1/0437/8689/5522/files/eugene_oregon_hourly_weather.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006552.bin
0b9ba9a596012b80a4690771a882366b1e87dacaa24eddef17f9a84f8a00fa76		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6552 5288 bytes
font_01_sfnt_off00007745.bin
f8978a564b149985558b7bc9dd4814029281e8f09ea42d6dda5660d67703490b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7745 10964 bytes
font_02_sfnt_off00009d09.bin
36e88bcac3f6702aa4285d6728274dd395a9fa8df4856bb2973d73c9e8333829		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9D09 16084 bytes

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