Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d993f37ce89f12e…

MALICIOUS

PDF

66.8 KB Created: 2020-08-09 08:12:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d690d0c4f24aa6bb4b5828d3b9e78e7f SHA-1: cdc1db5617f41c60ae1af03f5aa40a9a9b41af09 SHA-256: 4d993f37ce89f12eee8c199fa41cbdceddecda7062943855ea53397f484d41b6
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains multiple embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains the string 'https://ttraff.cc/pify?keyword=chinese+beginner+lessons+pdf', which is also flagged as a malicious redirector. This suggests the primary intent is to redirect the user to malicious infrastructure. The presence of numerous PDF links, many hosted on Shopify, indicates a potential link farm or SEO poisoning attempt to distribute malicious 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.cc/pify?keyword=chinese+beginner+lessons+pdf
    • http://files.feat1stfilms.com/uploads/1/3/0/7/130738841/1530111.pdf
    • http://suduxag.ifbiblechapel.org/uploads/1/3/1/3/131380213/xezuvamaj.pdf
    • http://files.assumptiondads.com/uploads/1/3/0/8/130814169/vunubisodive-siliw-vebulod-pudafofekas.pdf
    • https://cdn.shopify.com/s/files/1/0433/9341/7366/files/91887551876.pdf
    • https://cdn.shopify.com/s/files/1/0431/4929/5776/files/zivowo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/81143567733.pdf
    • https://cdn.shopify.com/s/files/1/0437/8027/6375/files/power_of_attorney_act_1882.pdf
    • https://cdn.shopify.com/s/files/1/0434/6331/1512/files/76670653271.pdf
    • https://cdn.shopify.com/s/files/1/0428/7699/3695/files/berker_k1_katalog.pdf
    • https://cdn.shopify.com/s/files/1/0429/7365/9292/files/sorenivobibuzorekadejema.pdf
    • https://cdn.shopify.com/s/files/1/0429/9295/9642/files/44882107600.pdf
    • https://cdn.shopify.com/s/files/1/0433/8450/4474/files/66396375485.pdf
    • https://cdn.shopify.com/s/files/1/0431/8298/1278/files/2774472935.pdf
    • https://cdn.shopify.com/s/files/1/0434/6370/4738/files/70026285363.pdf
    • https://cdn.shopify.com/s/files/1/0427/9051/8940/files/51068342749.pdf
    • https://cdn.shopify.com/s/files/1/0434/7746/7288/files/the_acid_alkaline_diet_for_optimum_health_pdf.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006c6c.bin
c3f9c43ad937cbd47d8953136cd87634d3798cebd2b6e605dda6727303cfb31c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C6C 22516 bytes
font_01_sfnt_off0000b32d.bin
659bc5e293e7717f0fde34addd58f533ce09c6e47791b8901a3f0398d6df3af8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB32D 5140 bytes
font_02_sfnt_off0000c498.bin
3cbcb3a46b5d1db53441ed01a8ca053481044733dac85718d12fe5d768a4eaaa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC498 11004 bytes
font_03_sfnt_off0000e907.bin
bfa98e3e5eb820fe05909e99d62c13760e50a0f9f38c5f93f4058dc7f7fbcb36		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE907 16064 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.