Malicious PDF — malware analysis report

Static analysis result for SHA-256 7104fbb10de9a074…

MALICIOUS

PDF

44.6 KB Created: 2020-08-01 12:06:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 27d3d0ca2abe12a97b5340099b5d7d51 SHA-1: cbc4aa31e8f4239cf1d9e3d174d4eb3ef1d18e25 SHA-256: 7104fbb10de9a074beb27ce9dd61b349d37e311c88b09cc490da65a68ee52cd8
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to what appears to be a link farm designed to distribute PDFs. One prominent URL, https://ttraff.ru/pify?keyword=the+american+republic+since+1877+answer+key, is identified as a malicious redirector. The document body, though heavily obfuscated, contains text related to an "answer key" and the malicious URL, suggesting a lure to trick users into clicking the link. The ML classifier also strongly flagged this PDF as malicious.

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=the+american+republic+since+1877+answer+key
    • http://files.shopshipnmore.com/uploads/1/3/1/4/131453595/fa82bc45dbf46c.pdf
    • http://files.dongarbutt.com/uploads/1/3/0/9/130969054/fatimixefovepuk_jimapoto_pevoboxupubere_voruzo.pdf
    • http://files.impossiblefarmher.com/uploads/1/3/1/4/131410234/rinoxufu.pdf
    • http://files.sidbollywood.com/uploads/1/3/2/6/132682232/fde5f76c10ae1d.pdf
    • http://files.albuquerquerenovation.com/uploads/1/3/1/6/131606003/97d9467cc8e0de.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0432/0644/3176/files/dusexex.pdf
    • https://cdn.shopify.com/s/files/1/0433/6726/8517/files/43805532162.pdf
    • https://cdn.shopify.com/s/files/1/0434/7346/9597/files/49949296129.pdf
    • https://cdn.shopify.com/s/files/1/0432/3170/7294/files/34092437526.pdf
    • https://cdn.shopify.com/s/files/1/0432/3803/1518/files/p._s._meaning.pdf
    • https://cdn.shopify.com/s/files/1/0431/5162/2306/files/sogevixu.pdf
    • https://cdn.shopify.com/s/files/1/0430/8962/5250/files/megoguxuwerobebifep.pdf
    • https://cdn.shopify.com/s/files/1/0431/6135/4389/files/88390010897.pdf
    • https://cdn.shopify.com/s/files/1/0432/4953/3088/files/pojofas.pdf
    • https://cdn.shopify.com/s/files/1/0431/9268/0605/files/67566021723.pdf
    • https://cdn.shopify.com/s/files/1/0435/5863/3631/files/lutoxojebijat.pdf
    • https://cdn.shopify.com/s/files/1/0432/1994/3579/files/ds3_parting_flame.pdf
    • https://cdn.shopify.com/s/files/1/0431/4179/1895/files/lezaruri.pdf
    • https://cdn.shopify.com/s/files/1/0437/9102/4280/files/kiwivetuxomi.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_off00006080.bin
e0ab445ddc6f59454534137d143d708cfd8715f60888979140c4c8b54a1f8ec9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6080 5540 bytes
font_01_sfnt_off00007338.bin
0c34ed707e056d98694daf8f5a0e9a09958762b469ebfb093acecc12d897f200		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7338 9960 bytes
font_02_sfnt_off000094e9.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x94E9 4324 bytes

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